x+x-3x=12

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Solution for x+x-3x=12 equation: 


Simplifying
x + x + -3x = 12

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

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

Solving
-1x = 12

Solving for variable 'x'.

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

Divide each side by '-1'.
x = -12

Simplifying
x = -12

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