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90=8x+66
We move all terms to the left:
90-(8x+66)=0
We get rid of parentheses
-8x-66+90=0
We add all the numbers together, and all the variables
-8x+24=0
We move all terms containing x to the left, all other terms to the right
-8x=-24
x=-24/-8
x=+3
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