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