x+2x+12-x=42

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Solution for x+2x+12-x=42 equation:


Simplifying
x + 2x + 12 + -1x = 42

Reorder the terms:
12 + x + 2x + -1x = 42

Combine like terms: x + 2x = 3x
12 + 3x + -1x = 42

Combine like terms: 3x + -1x = 2x
12 + 2x = 42

Solving
12 + 2x = 42

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 + 2x = 42 + -12

Combine like terms: 12 + -12 = 0
0 + 2x = 42 + -12
2x = 42 + -12

Combine like terms: 42 + -12 = 30
2x = 30

Divide each side by '2'.
x = 15

Simplifying
x = 15

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