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(5x+50)=90
We move all terms to the left:
(5x+50)-(90)=0
We get rid of parentheses
5x+50-90=0
We add all the numbers together, and all the variables
5x-40=0
We move all terms containing x to the left, all other terms to the right
5x=40
x=40/5
x=8
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