4y=81-5y

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Solution for 4y=81-5y equation: 



4y=81-5y

We move all terms to the left:

4y-(81-5y)=0

We add all the numbers together, and all the variables

4y-(-5y+81)=0

We get rid of parentheses

4y+5y-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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