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13=-y+4
We move all terms to the left:
13-(-y+4)=0
We add all the numbers together, and all the variables
-(-1y+4)+13=0
We get rid of parentheses
1y-4+13=0
We add all the numbers together, and all the variables
y+9=0
We move all terms containing y to the left, all other terms to the right
y=-9
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