31=20+v

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Solution for 31=20+v equation: 



31=20+v

We move all terms to the left:

31-(20+v)=0

We add all the numbers together, and all the variables

-(v+20)+31=0

We get rid of parentheses

-v-20+31=0

We add all the numbers together, and all the variables

-1v+11=0

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

-v=-11

v=-11/-1

v=+11

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