x+(6+x)+4(6+x)=126

Solution for x+(6+x)+4(6+x)=126 equation:

Simplifying
x + (6 + x) + 4(6 + x) = 126

Remove parenthesis around (6 + x)
x + 6 + x + 4(6 + x) = 126
x + 6 + x + (6 * 4 + x * 4) = 126
x + 6 + x + (24 + 4x) = 126

Reorder the terms:
6 + 24 + x + x + 4x = 126

Combine like terms: 6 + 24 = 30
30 + x + x + 4x = 126

Combine like terms: x + x = 2x
30 + 2x + 4x = 126

Combine like terms: 2x + 4x = 6x
30 + 6x = 126

Solving
30 + 6x = 126

Solving for variable 'x'.

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

Add '-30' to each side of the equation.
30 + -30 + 6x = 126 + -30

Combine like terms: 30 + -30 = 0
0 + 6x = 126 + -30
6x = 126 + -30

Combine like terms: 126 + -30 = 96
6x = 96

Divide each side by '6'.
x = 16

Simplifying
x = 16