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15y=12y+100
We move all terms to the left:
15y-(12y+100)=0
We get rid of parentheses
15y-12y-100=0
We add all the numbers together, and all the variables
3y-100=0
We move all terms containing y to the left, all other terms to the right
3y=100
y=100/3
y=33+1/3
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