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(2x+90)=180
We move all terms to the left:
(2x+90)-(180)=0
We get rid of parentheses
2x+90-180=0
We add all the numbers together, and all the variables
2x-90=0
We move all terms containing x to the left, all other terms to the right
2x=90
x=90/2
x=45
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