x+.20x=90

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Solution for x+.20x=90 equation: 



x+.20x=90

We move all terms to the left:

x+.20x-(90)=0

We add all the numbers together, and all the variables

1.2x-90=0

We move all terms containing x to the left, all other terms to the right

1.2x=90

x=90/1.2

x=75

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