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6+4y=12y-42
We move all terms to the left:
6+4y-(12y-42)=0
We get rid of parentheses
4y-12y+42+6=0
We add all the numbers together, and all the variables
-8y+48=0
We move all terms containing y to the left, all other terms to the right
-8y=-48
y=-48/-8
y=+6
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