2x+(x+6)+(x+6)=90

Solution for 2x+(x+6)+(x+6)=90 equation:

Simplifying
2x + (x + 6) + (x + 6) = 90

Reorder the terms:
2x + (6 + x) + (x + 6) = 90

Remove parenthesis around (6 + x)
2x + 6 + x + (x + 6) = 90

Reorder the terms:
2x + 6 + x + (6 + x) = 90

Remove parenthesis around (6 + x)
2x + 6 + x + 6 + x = 90

Reorder the terms:
6 + 6 + 2x + x + x = 90

Combine like terms: 6 + 6 = 12
12 + 2x + x + x = 90

Combine like terms: 2x + x = 3x
12 + 3x + x = 90

Combine like terms: 3x + x = 4x
12 + 4x = 90

Solving
12 + 4x = 90

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + 4x = 90 + -12

Combine like terms: 12 + -12 = 0
0 + 4x = 90 + -12
4x = 90 + -12

Combine like terms: 90 + -12 = 78
4x = 78

Divide each side by '4'.
x = 19.5

Simplifying
x = 19.5