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-81=13+8x-22
We move all terms to the left:
-81-(13+8x-22)=0
We add all the numbers together, and all the variables
-(8x-9)-81=0
We get rid of parentheses
-8x+9-81=0
We add all the numbers together, and all the variables
-8x-72=0
We move all terms containing x to the left, all other terms to the right
-8x=72
x=72/-8
x=-9
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