400-100=30*v

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Solution for 400-100=30*v equation: 



400-100=30v

We move all terms to the left:

400-100-(30v)=0

We add all the numbers together, and all the variables

-30v+300=0

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

-30v=-300

v=-300/-30

v=+10

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