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-y/2=51
We move all terms to the left:
-y/2-(51)=0
We multiply all the terms by the denominator
-y-51*2=0
We add all the numbers together, and all the variables
-1y-102=0
We move all terms containing y to the left, all other terms to the right
-y=102
y=102/-1
y=-102
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