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13y-8=20y+34
We move all terms to the left:
13y-8-(20y+34)=0
We get rid of parentheses
13y-20y-34-8=0
We add all the numbers together, and all the variables
-7y-42=0
We move all terms containing y to the left, all other terms to the right
-7y=42
y=42/-7
y=-6
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