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(2x-90)=80
We move all terms to the left:
(2x-90)-(80)=0
We get rid of parentheses
2x-90-80=0
We add all the numbers together, and all the variables
2x-170=0
We move all terms containing x to the left, all other terms to the right
2x=170
x=170/2
x=85
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