diff --git a/nessesary/equation/processing.py b/nessesary/equation/processing.py
new file mode 100644
index 0000000..78f28f1
--- /dev/null
+++ b/nessesary/equation/processing.py
@@ -0,0 +1,99 @@
+from nessesary.polynomial import Polynomial
+from nessesary.parser.parser import is_letter, is_op
+
+def change_side(equa:str):
+    """
+    Change all left side expression of = sign
+    to right side.
+    >>> change_side("x+2-x^2 = 32-x^3")
+    'x+2-x^2-32+x^3=0'
+    """
+    temp = ''
+    for i in equa:
+        if i == " ":
+            temp += ""
+        else:
+            temp += i
+    
+    equa = temp
+            
+    llist = equa.split("=")
+    left_side, right_side = llist[0], llist[1]
+
+    temp = ''
+    if (right_side[0] != "-") or (right_side[0] != "+"):
+        temp += '+'
+    temp += right_side
+    right_side = temp
+    for i in right_side:
+        if i == "+":
+            left_side += "-"
+        elif i == "-":
+            left_side += "+"
+        else:
+            left_side += i
+    return left_side
+
+def simplify(expr:str):
+    """
+    Use to_str() method of polynomial.
+    to sum and sub all coefficient.
+    """
+    poly = Polynomial(expr)
+    try:
+        result = poly.to_str()
+        return result
+    except:
+        raise ValueError
+
+def solver(expr:str):
+    """
+    Solve expression that using polynomial solve().
+    """
+    poly = Polynomial(expr)
+    try:
+        result = poly.solve()
+        return result
+    except:
+        raise ValueError
+
+def poly_expand(expr:str):
+    """
+    Add Polynomial Text to all element that
+    can make polynomial.
+    >>> poly_expand("(3x+2)^3+4x+5-2+(5x^2)^3")
+    'Polynomial("3x+2")**3+Polynomial("4x")+Polynomial("5x^2")**3'
+    """
+    i = 0
+    result = ""
+    found = False
+    added = False
+    while i < len(expr):
+        char = expr[i]
+        if char == "(":
+            result += "Polynomial("
+            i += 1
+            found = True
+        else:
+            if not found:
+                if added and is_op(char):
+                    result += f"){char}"
+
+                    added = False
+                if is_op(char) and char != "^":
+                    result += f"{char}Polynomial("
+                    i += 1
+                    added = True
+                    continue
+            result += char
+            i += 1
+
+        if char == ")":
+            found = False
+
+    result = result.replace("++", "+").replace("--","-")
+    result = result.replace("^^", "^")
+    result = result.replace("))", ")")
+    result = result.replace("^", "**")
+    result = result.replace("Polynomial(Polynomial(", "Polynomial(")
+    return result