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273=28-y
We move all terms to the left:
273-(28-y)=0
We add all the numbers together, and all the variables
-(-1y+28)+273=0
We get rid of parentheses
1y-28+273=0
We add all the numbers together, and all the variables
y+245=0
We move all terms containing y to the left, all other terms to the right
y=-245
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