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28-y=57-2
We move all terms to the left:
28-y-(57-2)=0
We add all the numbers together, and all the variables
-y+28-55=0
We add all the numbers together, and all the variables
-1y-27=0
We move all terms containing y to the left, all other terms to the right
-y=27
y=27/-1
y=-27
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