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12-4y=-3y
We move all terms to the left:
12-4y-(-3y)=0
We get rid of parentheses
-4y+3y+12=0
We add all the numbers together, and all the variables
-1y+12=0
We move all terms containing y to the left, all other terms to the right
-y=-12
y=-12/-1
y=+12
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