4=v-9

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Solution for 4=v-9 equation: 



4=v-9

We move all terms to the left:

4-(v-9)=0

We get rid of parentheses

-v+9+4=0

We add all the numbers together, and all the variables

-1v+13=0

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

-v=-13

v=-13/-1

v=+13

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