21=4(v+6)-7v

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Solution for 21=4(v+6)-7v equation: 



21=4(v+6)-7v

We move all terms to the left:

21-(4(v+6)-7v)=0



We calculate terms in parentheses: -(4(v+6)-7v), so:

4(v+6)-7v

We add all the numbers together, and all the variables

-7v+4(v+6)

We multiply parentheses

-7v+4v+24

We add all the numbers together, and all the variables

-3v+24

Back to the equation:

-(-3v+24)



We get rid of parentheses

3v-24+21=0

We add all the numbers together, and all the variables

3v-3=0

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

3v=3

v=3/3

v=1

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