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4y+3=y-12
We move all terms to the left:
4y+3-(y-12)=0
We get rid of parentheses
4y-y+12+3=0
We add all the numbers together, and all the variables
3y+15=0
We move all terms containing y to the left, all other terms to the right
3y=-15
y=-15/3
y=-5
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