x+(x-20)+(x+20)=120

Solution for x+(x-20)+(x+20)=120 equation:

Simplifying
x + (x + -20) + (x + 20) = 120

Reorder the terms:
x + (-20 + x) + (x + 20) = 120

Remove parenthesis around (-20 + x)
x + -20 + x + (x + 20) = 120

Reorder the terms:
x + -20 + x + (20 + x) = 120

Remove parenthesis around (20 + x)
x + -20 + x + 20 + x = 120

Reorder the terms:
-20 + 20 + x + x + x = 120

Combine like terms: -20 + 20 = 0
0 + x + x + x = 120
x + x + x = 120

Combine like terms: x + x = 2x
2x + x = 120

Combine like terms: 2x + x = 3x
3x = 120

Solving
3x = 120

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Divide each side by '3'.
x = 40

Simplifying
x = 40