21-12=3(x-9)

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Solution for 21-12=3(x-9) equation: 


Simplifying
21 + -12 = 3(x + -9)

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

Reorder the terms:
9 = 3(-9 + x)
9 = (-9 * 3 + x * 3)
9 = (-27 + 3x)

Solving
9 = -27 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
9 + -3x = -27 + 3x + -3x

Combine like terms: 3x + -3x = 0
9 + -3x = -27 + 0
9 + -3x = -27

Add '-9' to each side of the equation.
9 + -9 + -3x = -27 + -9

Combine like terms: 9 + -9 = 0
0 + -3x = -27 + -9
-3x = -27 + -9

Combine like terms: -27 + -9 = -36
-3x = -36

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

Simplifying
x = 12

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