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(7x+9)=90
We move all terms to the left:
(7x+9)-(90)=0
We get rid of parentheses
7x+9-90=0
We add all the numbers together, and all the variables
7x-81=0
We move all terms containing x to the left, all other terms to the right
7x=81
x=81/7
x=11+4/7
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