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15y-4=12y-8
We move all terms to the left:
15y-4-(12y-8)=0
We get rid of parentheses
15y-12y+8-4=0
We add all the numbers together, and all the variables
3y+4=0
We move all terms containing y to the left, all other terms to the right
3y=-4
y=-4/3
y=-1+1/3
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