21=7(v-4)

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Solution for 21=7(v-4) equation: 



21=7(v-4)

We move all terms to the left:

21-(7(v-4))=0



We calculate terms in parentheses: -(7(v-4)), so:

7(v-4)

We multiply parentheses

7v-28

Back to the equation:

-(7v-28)



We get rid of parentheses

-7v+28+21=0

We add all the numbers together, and all the variables

-7v+49=0

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

-7v=-49

v=-49/-7

v=+7

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