-21=3.5y

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Solution for -21=3.5y equation: 



-21=3.5y

We move all terms to the left:

-21-(3.5y)=0

We add all the numbers together, and all the variables

-(+3.5y)-21=0

We get rid of parentheses

-3.5y-21=0

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

-3.5y=21

y=21/-3.5

y=-6

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