x-9+2x=12

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


Simplifying
x + -9 + 2x = 12

Reorder the terms:
-9 + x + 2x = 12

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

Solving
-9 + 3x = 12

Solving for variable 'x'.

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

Add '9' to each side of the equation.
-9 + 9 + 3x = 12 + 9

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

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

Divide each side by '3'.
x = 7

Simplifying
x = 7

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