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1-y/3=-12
We move all terms to the left:
1-y/3-(-12)=0
We add all the numbers together, and all the variables
-y/3+13=0
We multiply all the terms by the denominator
-y+13*3=0
We add all the numbers together, and all the variables
-1y+39=0
We move all terms containing y to the left, all other terms to the right
-y=-39
y=-39/-1
y=+39
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