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90-8x=2x+1
We move all terms to the left:
90-8x-(2x+1)=0
We get rid of parentheses
-8x-2x-1+90=0
We add all the numbers together, and all the variables
-10x+89=0
We move all terms containing x to the left, all other terms to the right
-10x=-89
x=-89/-10
x=8+9/10
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