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13=-y+273
We move all terms to the left:
13-(-y+273)=0
We add all the numbers together, and all the variables
-(-1y+273)+13=0
We get rid of parentheses
1y-273+13=0
We add all the numbers together, and all the variables
y-260=0
We move all terms containing y to the left, all other terms to the right
y=260
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