90=-2x+120

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Solution for 90=-2x+120 equation: 



90=-2x+120

We move all terms to the left:

90-(-2x+120)=0

We get rid of parentheses

2x-120+90=0

We add all the numbers together, and all the variables

2x-30=0

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

2x=30

x=30/2

x=15

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