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3y-12=42-6y
We move all terms to the left:
3y-12-(42-6y)=0
We add all the numbers together, and all the variables
3y-(-6y+42)-12=0
We get rid of parentheses
3y+6y-42-12=0
We add all the numbers together, and all the variables
9y-54=0
We move all terms containing y to the left, all other terms to the right
9y=54
y=54/9
y=6
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