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283=-y+12
We move all terms to the left:
283-(-y+12)=0
We add all the numbers together, and all the variables
-(-1y+12)+283=0
We get rid of parentheses
1y-12+283=0
We add all the numbers together, and all the variables
y+271=0
We move all terms containing y to the left, all other terms to the right
y=-271
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