-20-12v=20+20-9v

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Solution for -20-12v=20+20-9v equation: 



-20-12v=20+20-9v

We move all terms to the left:

-20-12v-(20+20-9v)=0

We add all the numbers together, and all the variables

-12v-(-9v+40)-20=0

We get rid of parentheses

-12v+9v-40-20=0

We add all the numbers together, and all the variables

-3v-60=0

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

-3v=60

v=60/-3

v=-20

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