21=5(v+6)-8v

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Solution for 21=5(v+6)-8v equation: 



21=5(v+6)-8v

We move all terms to the left:

21-(5(v+6)-8v)=0



We calculate terms in parentheses: -(5(v+6)-8v), so:

5(v+6)-8v

We add all the numbers together, and all the variables

-8v+5(v+6)

We multiply parentheses

-8v+5v+30

We add all the numbers together, and all the variables

-3v+30

Back to the equation:

-(-3v+30)



We get rid of parentheses

3v-30+21=0

We add all the numbers together, and all the variables

3v-9=0

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

3v=9

v=9/3

v=3

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