x+x-2x+4x+6=42

Solution for x+x-2x+4x+6=42 equation:

Simplifying
x + x + -2x + 4x + 6 = 42

Reorder the terms:
6 + x + x + -2x + 4x = 42

Combine like terms: x + x = 2x
6 + 2x + -2x + 4x = 42

Combine like terms: 2x + -2x = 0
6 + 0 + 4x = 42
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