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-57=-y/7
We move all terms to the left:
-57-(-y/7)=0
We get rid of parentheses
y/7-57=0
We multiply all the terms by the denominator
y-57*7=0
We add all the numbers together, and all the variables
y-399=0
We move all terms containing y to the left, all other terms to the right
y=399
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