-31-8v=7(7-4v)

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Solution for -31-8v=7(7-4v) equation: 



-31-8v=7(7-4v)

We move all terms to the left:

-31-8v-(7(7-4v))=0

We add all the numbers together, and all the variables

-8v-(7(-4v+7))-31=0



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

7(-4v+7)

We multiply parentheses

-28v+49

Back to the equation:

-(-28v+49)



We get rid of parentheses

-8v+28v-49-31=0

We add all the numbers together, and all the variables

20v-80=0

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

20v=80

v=80/20

v=4

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