21=2y+3y+1

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Solution for 21=2y+3y+1 equation: 



21=2y+3y+1

We move all terms to the left:

21-(2y+3y+1)=0

We add all the numbers together, and all the variables

-(5y+1)+21=0

We get rid of parentheses

-5y-1+21=0

We add all the numbers together, and all the variables

-5y+20=0

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

-5y=-20

y=-20/-5

y=+4

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