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-y/3=13
We move all terms to the left:
-y/3-(13)=0
We multiply all the terms by the denominator
-y-13*3=0
We add all the numbers together, and all the variables
-1y-39=0
We move all terms containing y to the left, all other terms to the right
-y=39
y=39/-1
y=-39
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