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15y-9=4y+8+8y+4
We move all terms to the left:
15y-9-(4y+8+8y+4)=0
We add all the numbers together, and all the variables
15y-(12y+12)-9=0
We get rid of parentheses
15y-12y-12-9=0
We add all the numbers together, and all the variables
3y-21=0
We move all terms containing y to the left, all other terms to the right
3y=21
y=21/3
y=7
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