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4y+12=15y+9
We move all terms to the left:
4y+12-(15y+9)=0
We get rid of parentheses
4y-15y-9+12=0
We add all the numbers together, and all the variables
-11y+3=0
We move all terms containing y to the left, all other terms to the right
-11y=-3
y=-3/-11
y=3/11
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