13y=81+4y

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Solution for 13y=81+4y equation: 



13y=81+4y

We move all terms to the left:

13y-(81+4y)=0

We add all the numbers together, and all the variables

13y-(4y+81)=0

We get rid of parentheses

13y-4y-81=0

We add all the numbers together, and all the variables

9y-81=0

We move all terms containing y to the left, all other terms to the right

9y=81

y=81/9

y=9

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