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13=-y/4
We move all terms to the left:
13-(-y/4)=0
We get rid of parentheses
y/4+13=0
We multiply all the terms by the denominator
y+13*4=0
We add all the numbers together, and all the variables
y+52=0
We move all terms containing y to the left, all other terms to the right
y=-52
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