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-42=-y/4
We move all terms to the left:
-42-(-y/4)=0
We get rid of parentheses
y/4-42=0
We multiply all the terms by the denominator
y-42*4=0
We add all the numbers together, and all the variables
y-168=0
We move all terms containing y to the left, all other terms to the right
y=168
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