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13y-7=12y+21-47
We move all terms to the left:
13y-7-(12y+21-47)=0
We add all the numbers together, and all the variables
13y-(12y-26)-7=0
We get rid of parentheses
13y-12y+26-7=0
We add all the numbers together, and all the variables
y+19=0
We move all terms containing y to the left, all other terms to the right
y=-19
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