y+21=3y+1

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Solution for y+21=3y+1 equation: 



y+21=3y+1

We move all terms to the left:

y+21-(3y+1)=0

We get rid of parentheses

y-3y-1+21=0

We add all the numbers together, and all the variables

-2y+20=0

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

-2y=-20

y=-20/-2

y=+10

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