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(7x)+(2x+27)=90
We move all terms to the left:
(7x)+(2x+27)-(90)=0
We get rid of parentheses
7x+2x+27-90=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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