12=-x-2x

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Solution for 12=-x-2x equation:


Simplifying
12 = -1x + -2x

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

Solving
12 = -3x

Solving for variable 'x'.

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

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

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

Add '-12' to each side of the equation.
12 + -12 + 3x = 0 + -12

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

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

Divide each side by '3'.
x = -4

Simplifying
x = -4

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