(84-y)=3y

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Solution for (84-y)=3y equation: 



(84-y)=3y

We move all terms to the left:

(84-y)-(3y)=0

We add all the numbers together, and all the variables

(-1y+84)-3y=0

We add all the numbers together, and all the variables

-3y+(-1y+84)=0

We get rid of parentheses

-3y-1y+84=0

We add all the numbers together, and all the variables

-4y+84=0

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

-4y=-84

y=-84/-4

y=+21

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