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57+4y=21+6y
We move all terms to the left:
57+4y-(21+6y)=0
We add all the numbers together, and all the variables
4y-(6y+21)+57=0
We get rid of parentheses
4y-6y-21+57=0
We add all the numbers together, and all the variables
-2y+36=0
We move all terms containing y to the left, all other terms to the right
-2y=-36
y=-36/-2
y=+18
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