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(2x+7)+65=90
We move all terms to the left:
(2x+7)+65-(90)=0
We add all the numbers together, and all the variables
(2x+7)-25=0
We get rid of parentheses
2x+7-25=0
We add all the numbers together, and all the variables
2x-18=0
We move all terms containing x to the left, all other terms to the right
2x=18
x=18/2
x=9
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