-3x-21=-x+9

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Solution for -3x-21=-x+9 equation:


Simplifying
-3x + -21 = -1x + 9

Reorder the terms:
-21 + -3x = -1x + 9

Reorder the terms:
-21 + -3x = 9 + -1x

Solving
-21 + -3x = 9 + -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.
-21 + -3x + x = 9 + -1x + x

Combine like terms: -3x + x = -2x
-21 + -2x = 9 + -1x + x

Combine like terms: -1x + x = 0
-21 + -2x = 9 + 0
-21 + -2x = 9

Add '21' to each side of the equation.
-21 + 21 + -2x = 9 + 21

Combine like terms: -21 + 21 = 0
0 + -2x = 9 + 21
-2x = 9 + 21

Combine like terms: 9 + 21 = 30
-2x = 30

Divide each side by '-2'.
x = -15

Simplifying
x = -15

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