x+2x+(x+6)=42

Solution for x+2x+(x+6)=42 equation:

Simplifying
x + 2x + (x + 6) = 42

Reorder the terms:
x + 2x + (6 + x) = 42

Remove parenthesis around (6 + x)
x + 2x + 6 + x = 42

Reorder the terms:
6 + x + 2x + x = 42

Combine like terms: x + 2x = 3x
6 + 3x + x = 42

Combine like terms: 3x + x = 4x
6 + 4x = 42

Solving
6 + 4x = 42

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 + 4x = 42 + -6

Combine like terms: 6 + -6 = 0
0 + 4x = 42 + -6
4x = 42 + -6

Combine like terms: 42 + -6 = 36
4x = 36

Divide each side by '4'.
x = 9

Simplifying
x = 9