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(9x+66)=90
We move all terms to the left:
(9x+66)-(90)=0
We get rid of parentheses
9x+66-90=0
We add all the numbers together, and all the variables
9x-24=0
We move all terms containing x to the left, all other terms to the right
9x=24
x=24/9
x=2+2/3
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