3+x-2x=12

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Solution for 3+x-2x=12 equation: 


Simplifying
3 + x + -2x = 12

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

Solving
3 + -1x = 12

Solving for variable 'x'.

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

Add '-3' to each side of the equation.
3 + -3 + -1x = 12 + -3

Combine like terms: 3 + -3 = 0
0 + -1x = 12 + -3
-1x = 12 + -3

Combine like terms: 12 + -3 = 9
-1x = 9

Divide each side by '-1'.
x = -9

Simplifying
x = -9

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