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(2x+30)+(7x-3)=90
We move all terms to the left:
(2x+30)+(7x-3)-(90)=0
We get rid of parentheses
2x+7x+30-3-90=0
We add all the numbers together, and all the variables
9x-63=0
We move all terms containing x to the left, all other terms to the right
9x=63
x=63/9
x=7
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