x+(x+6)=90

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

Simplifying
x + (x + 6) = 90

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

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

Reorder the terms:
6 + x + x = 90

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

Solving
6 + 2x = 90

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 + 2x = 90 + -6

Combine like terms: 6 + -6 = 0
0 + 2x = 90 + -6
2x = 90 + -6

Combine like terms: 90 + -6 = 84
2x = 84

Divide each side by '2'.
x = 42

Simplifying
x = 42