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14+13y=20y+21
We move all terms to the left:
14+13y-(20y+21)=0
We get rid of parentheses
13y-20y-21+14=0
We add all the numbers together, and all the variables
-7y-7=0
We move all terms containing y to the left, all other terms to the right
-7y=7
y=7/-7
y=-1
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