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12+4(-3y-1)-y=0
We add all the numbers together, and all the variables
-1y+4(-3y-1)+12=0
We multiply parentheses
-1y-12y-4+12=0
We add all the numbers together, and all the variables
-13y+8=0
We move all terms containing y to the left, all other terms to the right
-13y=-8
y=-8/-13
y=8/13
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