4v-2v=-30

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Solution for 4v-2v=-30 equation: 



4v-2v=-30

We move all terms to the left:

4v-2v-(-30)=0

We add all the numbers together, and all the variables

2v+30=0

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

2v=-30

v=-30/2

v=-15

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