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-9+v=7v+9

We move all terms to the left:

-9+v-(7v+9)=0

We get rid of parentheses

v-7v-9-9=0

We add all the numbers together, and all the variables

-6v-18=0

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

-6v=18

v=18/-6

v=-3

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