12=-3x-x

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Solution for 12=-3x-x equation:


Simplifying
12 = -3x + -1x

Combine like terms: -3x + -1x = -4x
12 = -4x

Solving
12 = -4x

Solving for variable 'x'.

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

Add '4x' to each side of the equation.
12 + 4x = -4x + 4x

Combine like terms: -4x + 4x = 0
12 + 4x = 0

Add '-12' to each side of the equation.
12 + -12 + 4x = 0 + -12

Combine like terms: 12 + -12 = 0
0 + 4x = 0 + -12
4x = 0 + -12

Combine like terms: 0 + -12 = -12
4x = -12

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

Simplifying
x = -3

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