.4x-.2x=9

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Solution for .4x-.2x=9 equation: 


Simplifying
0.4x + -0.2x = 9

Combine like terms: 0.4x + -0.2x = 0.2x
0.2x = 9

Solving
0.2x = 9

Solving for variable 'x'.

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

Divide each side by '0.2'.
x = 45

Simplifying
x = 45

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