3x+12=-x

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Solution for 3x+12=-x equation:


Simplifying
3x + 12 = -1x

Reorder the terms:
12 + 3x = -1x

Solving
12 + 3x = -1x

Solving for variable 'x'.

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

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

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

Combine like terms: -1x + x = 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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