15x-9=3x-81

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Solution for 15x-9=3x-81 equation:


Simplifying
15x + -9 = 3x + -81

Reorder the terms:
-9 + 15x = 3x + -81

Reorder the terms:
-9 + 15x = -81 + 3x

Solving
-9 + 15x = -81 + 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 + 15x + -3x = -81 + 3x + -3x

Combine like terms: 15x + -3x = 12x
-9 + 12x = -81 + 3x + -3x

Combine like terms: 3x + -3x = 0
-9 + 12x = -81 + 0
-9 + 12x = -81

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

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

Combine like terms: -81 + 9 = -72
12x = -72

Divide each side by '12'.
x = -6

Simplifying
x = -6

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