81=x+8x

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Solution for 81=x+8x equation:


Simplifying
81 = x + 8x

Combine like terms: x + 8x = 9x
81 = 9x

Solving
81 = 9x

Solving for variable 'x'.

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

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

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

Add '-81' to each side of the equation.
81 + -81 + -9x = 0 + -81

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

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

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

Simplifying
x = 9

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