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12y-17=4y+15
We move all terms to the left:
12y-17-(4y+15)=0
We get rid of parentheses
12y-4y-15-17=0
We add all the numbers together, and all the variables
8y-32=0
We move all terms containing y to the left, all other terms to the right
8y=32
y=32/8
y=4
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