2y+21=7y+1

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Solution for 2y+21=7y+1 equation: 



2y+21=7y+1

We move all terms to the left:

2y+21-(7y+1)=0

We get rid of parentheses

2y-7y-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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