x-0.1x=3900

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Solution for x-0.1x=3900 equation: 


Simplifying
x + -0.1x = 3900

Combine like terms: x + -0.1x = 0.9x
0.9x = 3900

Solving
0.9x = 3900

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 = 4333.333333

Simplifying
x = 4333.333333

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