12x+15=9x-21

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Solution for 12x+15=9x-21 equation:


Simplifying
12x + 15 = 9x + -21

Reorder the terms:
15 + 12x = 9x + -21

Reorder the terms:
15 + 12x = -21 + 9x

Solving
15 + 12x = -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 + 12x + -9x = -21 + 9x + -9x

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

Combine like terms: 9x + -9x = 0
15 + 3x = -21 + 0
15 + 3x = -21

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

Combine like terms: 15 + -15 = 0
0 + 3x = -21 + -15
3x = -21 + -15

Combine like terms: -21 + -15 = -36
3x = -36

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

Simplifying
x = -12

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