x-.1x=81

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Solution for x-.1x=81 equation: 


Simplifying
x + -0.1x = 81

Combine like terms: x + -0.1x = 0.9x
0.9x = 81

Solving
0.9x = 81

Solving for variable 'x'.

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

Divide each side by '0.9'.
x = 90

Simplifying
x = 90

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