3x-12=8x+9

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Solution for 3x-12=8x+9 equation:


Simplifying
3x + -12 = 8x + 9

Reorder the terms:
-12 + 3x = 8x + 9

Reorder the terms:
-12 + 3x = 9 + 8x

Solving
-12 + 3x = 9 + 8x

Solving for variable 'x'.

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

Add '-8x' to each side of the equation.
-12 + 3x + -8x = 9 + 8x + -8x

Combine like terms: 3x + -8x = -5x
-12 + -5x = 9 + 8x + -8x

Combine like terms: 8x + -8x = 0
-12 + -5x = 9 + 0
-12 + -5x = 9

Add '12' to each side of the equation.
-12 + 12 + -5x = 9 + 12

Combine like terms: -12 + 12 = 0
0 + -5x = 9 + 12
-5x = 9 + 12

Combine like terms: 9 + 12 = 21
-5x = 21

Divide each side by '-5'.
x = -4.2

Simplifying
x = -4.2

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