-12+x+2x=9

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Solution for -12+x+2x=9 equation: 


Simplifying
-12 + x + 2x = 9

Combine like terms: x + 2x = 3x
-12 + 3x = 9

Solving
-12 + 3x = 9

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 + 3x = 9 + 12

Combine like terms: -12 + 12 = 0
0 + 3x = 9 + 12
3x = 9 + 12

Combine like terms: 9 + 12 = 21
3x = 21

Divide each side by '3'.
x = 7

Simplifying
x = 7

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