v+20=-v

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Solution for v+20=-v equation: 



v+20=-v

We move all terms to the left:

v+20-(-v)=0

We add all the numbers together, and all the variables

v-(-1v)+20=0

We get rid of parentheses

v+1v+20=0

We add all the numbers together, and all the variables

2v+20=0

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

2v=-20

v=-20/2

v=-10

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