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57=15+8x
We move all terms to the left:
57-(15+8x)=0
We add all the numbers together, and all the variables
-(8x+15)+57=0
We get rid of parentheses
-8x-15+57=0
We add all the numbers together, and all the variables
-8x+42=0
We move all terms containing x to the left, all other terms to the right
-8x=-42
x=-42/-8
x=5+1/4
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