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33+(7x+8)=90
We move all terms to the left:
33+(7x+8)-(90)=0
We add all the numbers together, and all the variables
(7x+8)-57=0
We get rid of parentheses
7x+8-57=0
We add all the numbers together, and all the variables
7x-49=0
We move all terms containing x to the left, all other terms to the right
7x=49
x=49/7
x=7
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