20-9v=-20-13v

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Solution for 20-9v=-20-13v equation: 



20-9v=-20-13v

We move all terms to the left:

20-9v-(-20-13v)=0

We add all the numbers together, and all the variables

-9v-(-13v-20)+20=0

We get rid of parentheses

-9v+13v+20+20=0

We add all the numbers together, and all the variables

4v+40=0

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

4v=-40

v=-40/4

v=-10

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