21=4+5v

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Solution for 21=4+5v equation: 



21=4+5v

We move all terms to the left:

21-(4+5v)=0

We add all the numbers together, and all the variables

-(5v+4)+21=0

We get rid of parentheses

-5v-4+21=0

We add all the numbers together, and all the variables

-5v+17=0

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

-5v=-17

v=-17/-5

v=3+2/5

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