-x-12+3x+6=x-21

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Solution for -x-12+3x+6=x-21 equation:


Simplifying
-1x + -12 + 3x + 6 = x + -21

Reorder the terms:
-12 + 6 + -1x + 3x = x + -21

Combine like terms: -12 + 6 = -6
-6 + -1x + 3x = x + -21

Combine like terms: -1x + 3x = 2x
-6 + 2x = x + -21

Reorder the terms:
-6 + 2x = -21 + x

Solving
-6 + 2x = -21 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
-6 + 2x + -1x = -21 + x + -1x

Combine like terms: 2x + -1x = 1x
-6 + 1x = -21 + x + -1x

Combine like terms: x + -1x = 0
-6 + 1x = -21 + 0
-6 + 1x = -21

Add '6' to each side of the equation.
-6 + 6 + 1x = -21 + 6

Combine like terms: -6 + 6 = 0
0 + 1x = -21 + 6
1x = -21 + 6

Combine like terms: -21 + 6 = -15
1x = -15

Divide each side by '1'.
x = -15

Simplifying
x = -15

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