84-y=4y+9

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Solution for 84-y=4y+9 equation: 



84-y=4y+9

We move all terms to the left:

84-y-(4y+9)=0

We add all the numbers together, and all the variables

-1y-(4y+9)+84=0

We get rid of parentheses

-1y-4y-9+84=0

We add all the numbers together, and all the variables

-5y+75=0

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

-5y=-75

y=-75/-5

y=+15

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