-3x-15=9x+21

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Solution for -3x-15=9x+21 equation:


Simplifying
-3x + -15 = 9x + 21

Reorder the terms:
-15 + -3x = 9x + 21

Reorder the terms:
-15 + -3x = 21 + 9x

Solving
-15 + -3x = 21 + 9x

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
-15 + -3x + -9x = 21 + 9x + -9x

Combine like terms: -3x + -9x = -12x
-15 + -12x = 21 + 9x + -9x

Combine like terms: 9x + -9x = 0
-15 + -12x = 21 + 0
-15 + -12x = 21

Add '15' to each side of the equation.
-15 + 15 + -12x = 21 + 15

Combine like terms: -15 + 15 = 0
0 + -12x = 21 + 15
-12x = 21 + 15

Combine like terms: 21 + 15 = 36
-12x = 36

Divide each side by '-12'.
x = -3

Simplifying
x = -3

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