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(2x+7)+63=90
We move all terms to the left:
(2x+7)+63-(90)=0
We add all the numbers together, and all the variables
(2x+7)-27=0
We get rid of parentheses
2x+7-27=0
We add all the numbers together, and all the variables
2x-20=0
We move all terms containing x to the left, all other terms to the right
2x=20
x=20/2
x=10
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