31=5v+3(v-3)

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Solution for 31=5v+3(v-3) equation: 



31=5v+3(v-3)

We move all terms to the left:

31-(5v+3(v-3))=0



We calculate terms in parentheses: -(5v+3(v-3)), so:

5v+3(v-3)

We multiply parentheses

5v+3v-9

We add all the numbers together, and all the variables

8v-9

Back to the equation:

-(8v-9)



We get rid of parentheses

-8v+9+31=0

We add all the numbers together, and all the variables

-8v+40=0

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

-8v=-40

v=-40/-8

v=+5

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