15=9v-4v

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Solution for 15=9v-4v equation: 



15=9v-4v

We move all terms to the left:

15-(9v-4v)=0

We add all the numbers together, and all the variables

-(+5v)+15=0

We get rid of parentheses

-5v+15=0

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

-5v=-15

v=-15/-5

v=+3

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