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12-y-3y=12+y-3
We move all terms to the left:
12-y-3y-(12+y-3)=0
We add all the numbers together, and all the variables
-y-3y-(y+9)+12=0
We add all the numbers together, and all the variables
-4y-(y+9)+12=0
We get rid of parentheses
-4y-y-9+12=0
We add all the numbers together, and all the variables
-5y+3=0
We move all terms containing y to the left, all other terms to the right
-5y=-3
y=-3/-5
y=3/5
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