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13y+20=15y-20-6y
We move all terms to the left:
13y+20-(15y-20-6y)=0
We add all the numbers together, and all the variables
13y-(9y-20)+20=0
We get rid of parentheses
13y-9y+20+20=0
We add all the numbers together, and all the variables
4y+40=0
We move all terms containing y to the left, all other terms to the right
4y=-40
y=-40/4
y=-10
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