X-.9X=64

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Solution for X-.9X=64 equation: 


Simplifying
X + -0.9X = 64

Combine like terms: X + -0.9X = 0.1X
0.1X = 64

Solving
0.1X = 64

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 = 640

Simplifying
X = 640

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