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12y-13=4y+8
We move all terms to the left:
12y-13-(4y+8)=0
We get rid of parentheses
12y-4y-8-13=0
We add all the numbers together, and all the variables
8y-21=0
We move all terms containing y to the left, all other terms to the right
8y=21
y=21/8
y=2+5/8
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