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2y-54=-y+21
We move all terms to the left:
2y-54-(-y+21)=0
We add all the numbers together, and all the variables
2y-(-1y+21)-54=0
We get rid of parentheses
2y+1y-21-54=0
We add all the numbers together, and all the variables
3y-75=0
We move all terms containing y to the left, all other terms to the right
3y=75
y=75/3
y=25
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