21=4v+5

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Solution for 21=4v+5 equation: 



21=4v+5

We move all terms to the left:

21-(4v+5)=0

We get rid of parentheses

-4v-5+21=0

We add all the numbers together, and all the variables

-4v+16=0

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

-4v=-16

v=-16/-4

v=+4

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