21+y=4y

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Solution for 21+y=4y equation: 



21+y=4y

We move all terms to the left:

21+y-(4y)=0

We add all the numbers together, and all the variables

-3y+21=0

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

-3y=-21

y=-21/-3

y=+7

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