x+12=3x-9

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Solution for x+12=3x-9 equation:


Simplifying
x + 12 = 3x + -9

Reorder the terms:
12 + x = 3x + -9

Reorder the terms:
12 + x = -9 + 3x

Solving
12 + x = -9 + 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.
12 + x + -3x = -9 + 3x + -3x

Combine like terms: x + -3x = -2x
12 + -2x = -9 + 3x + -3x

Combine like terms: 3x + -3x = 0
12 + -2x = -9 + 0
12 + -2x = -9

Add '-12' to each side of the equation.
12 + -12 + -2x = -9 + -12

Combine like terms: 12 + -12 = 0
0 + -2x = -9 + -12
-2x = -9 + -12

Combine like terms: -9 + -12 = -21
-2x = -21

Divide each side by '-2'.
x = 10.5

Simplifying
x = 10.5

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