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(7x-18)=90
We move all terms to the left:
(7x-18)-(90)=0
We get rid of parentheses
7x-18-90=0
We add all the numbers together, and all the variables
7x-108=0
We move all terms containing x to the left, all other terms to the right
7x=108
x=108/7
x=15+3/7
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