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y+6=4y-15
We move all terms to the left:
y+6-(4y-15)=0
We get rid of parentheses
y-4y+15+6=0
We add all the numbers together, and all the variables
-3y+21=0
We move all terms containing y to the left, all other terms to the right
-3y=-21
y=-21/-3
y=+7
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