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14+13y=20-21
We move all terms to the left:
14+13y-(20-21)=0
We add all the numbers together, and all the variables
13y+14-(-1)=0
We add all the numbers together, and all the variables
13y+15=0
We move all terms containing y to the left, all other terms to the right
13y=-15
y=-15/13
y=-1+2/13
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