x+(x+18)+(x-12)=

Solution for x+(x+18)+(x-12)= equation:

Simplifying
x + (x + 18) + (x + -12) = 0

Reorder the terms:
x + (18 + x) + (x + -12) = 0

Remove parenthesis around (18 + x)
x + 18 + x + (x + -12) = 0

Reorder the terms:
x + 18 + x + (-12 + x) = 0

Remove parenthesis around (-12 + x)
x + 18 + x + -12 + x = 0

Reorder the terms:
18 + -12 + x + x + x = 0

Combine like terms: 18 + -12 = 6
6 + x + x + x = 0

Combine like terms: x + x = 2x
6 + 2x + x = 0

Combine like terms: 2x + x = 3x
6 + 3x = 0

Solving
6 + 3x = 0

Solving for variable 'x'.

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

Add '-6' to each side of the equation.
6 + -6 + 3x = 0 + -6

Combine like terms: 6 + -6 = 0
0 + 3x = 0 + -6
3x = 0 + -6

Combine like terms: 0 + -6 = -6
3x = -6

Divide each side by '3'.
x = -2

Simplifying
x = -2