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57=-23+8x
We move all terms to the left:
57-(-23+8x)=0
We add all the numbers together, and all the variables
-(8x-23)+57=0
We get rid of parentheses
-8x+23+57=0
We add all the numbers together, and all the variables
-8x+80=0
We move all terms containing x to the left, all other terms to the right
-8x=-80
x=-80/-8
x=+10
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