x-.9x=78

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Solution for x-.9x=78 equation: 


Simplifying
x + -0.9x = 78

Combine like terms: x + -0.9x = 0.1x
0.1x = 78

Solving
0.1x = 78

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 = 780

Simplifying
x = 780

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