3x+9=12x+81

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Solution for 3x+9=12x+81 equation:


Simplifying
3x + 9 = 12x + 81

Reorder the terms:
9 + 3x = 12x + 81

Reorder the terms:
9 + 3x = 81 + 12x

Solving
9 + 3x = 81 + 12x

Solving for variable 'x'.

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

Add '-12x' to each side of the equation.
9 + 3x + -12x = 81 + 12x + -12x

Combine like terms: 3x + -12x = -9x
9 + -9x = 81 + 12x + -12x

Combine like terms: 12x + -12x = 0
9 + -9x = 81 + 0
9 + -9x = 81

Add '-9' to each side of the equation.
9 + -9 + -9x = 81 + -9

Combine like terms: 9 + -9 = 0
0 + -9x = 81 + -9
-9x = 81 + -9

Combine like terms: 81 + -9 = 72
-9x = 72

Divide each side by '-9'.
x = -8

Simplifying
x = -8

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