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6=42-3y
We move all terms to the left:
6-(42-3y)=0
We add all the numbers together, and all the variables
-(-3y+42)+6=0
We get rid of parentheses
3y-42+6=0
We add all the numbers together, and all the variables
3y-36=0
We move all terms containing y to the left, all other terms to the right
3y=36
y=36/3
y=12
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