12+3x=-x-8

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Solution for 12+3x=-x-8 equation:


Simplifying
12 + 3x = -1x + -8

Reorder the terms:
12 + 3x = -8 + -1x

Solving
12 + 3x = -8 + -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 = -8 + -1x + x

Combine like terms: 3x + x = 4x
12 + 4x = -8 + -1x + x

Combine like terms: -1x + x = 0
12 + 4x = -8 + 0
12 + 4x = -8

Add '-12' to each side of the equation.
12 + -12 + 4x = -8 + -12

Combine like terms: 12 + -12 = 0
0 + 4x = -8 + -12
4x = -8 + -12

Combine like terms: -8 + -12 = -20
4x = -20

Divide each side by '4'.
x = -5

Simplifying
x = -5

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