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-45=-12-y
We move all terms to the left:
-45-(-12-y)=0
We add all the numbers together, and all the variables
-(-1y-12)-45=0
We get rid of parentheses
1y+12-45=0
We add all the numbers together, and all the variables
y-33=0
We move all terms containing y to the left, all other terms to the right
y=33
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