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-39=-y/2
We move all terms to the left:
-39-(-y/2)=0
We get rid of parentheses
y/2-39=0
We multiply all the terms by the denominator
y-39*2=0
We add all the numbers together, and all the variables
y-78=0
We move all terms containing y to the left, all other terms to the right
y=78
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