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42=3y-6
We move all terms to the left:
42-(3y-6)=0
We get rid of parentheses
-3y+6+42=0
We add all the numbers together, and all the variables
-3y+48=0
We move all terms containing y to the left, all other terms to the right
-3y=-48
y=-48/-3
y=+16
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