-21=4+5y

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Solution for -21=4+5y equation: 



-21=4+5y

We move all terms to the left:

-21-(4+5y)=0

We add all the numbers together, and all the variables

-(5y+4)-21=0

We get rid of parentheses

-5y-4-21=0

We add all the numbers together, and all the variables

-5y-25=0

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

-5y=25

y=25/-5

y=-5

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