y+84=3y-84

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Solution for y+84=3y-84 equation: 



y+84=3y-84

We move all terms to the left:

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

We get rid of parentheses

y-3y+84+84=0

We add all the numbers together, and all the variables

-2y+168=0

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

-2y=-168

y=-168/-2

y=+84

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