x-.9x=7

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Solution for x-.9x=7 equation: 


Simplifying
x + -0.9x = 7

Combine like terms: x + -0.9x = 0.1x
0.1x = 7

Solving
0.1x = 7

Solving for variable 'x'.

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

Divide each side by '0.1'.
x = 70

Simplifying
x = 70

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