31=10-7v

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Solution for 31=10-7v equation: 



31=10-7v

We move all terms to the left:

31-(10-7v)=0

We add all the numbers together, and all the variables

-(-7v+10)+31=0

We get rid of parentheses

7v-10+31=0

We add all the numbers together, and all the variables

7v+21=0

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

7v=-21

v=-21/7

v=-3

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