2x+81=8x-9

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Solution for 2x+81=8x-9 equation:


Simplifying
2x + 81 = 8x + -9

Reorder the terms:
81 + 2x = 8x + -9

Reorder the terms:
81 + 2x = -9 + 8x

Solving
81 + 2x = -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.
81 + 2x + -8x = -9 + 8x + -8x

Combine like terms: 2x + -8x = -6x
81 + -6x = -9 + 8x + -8x

Combine like terms: 8x + -8x = 0
81 + -6x = -9 + 0
81 + -6x = -9

Add '-81' to each side of the equation.
81 + -81 + -6x = -9 + -81

Combine like terms: 81 + -81 = 0
0 + -6x = -9 + -81
-6x = -9 + -81

Combine like terms: -9 + -81 = -90
-6x = -90

Divide each side by '-6'.
x = 15

Simplifying
x = 15

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