42=51-v

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Solution for 42=51-v equation: 



42=51-v

We move all terms to the left:

42-(51-v)=0

We add all the numbers together, and all the variables

-(-1v+51)+42=0

We get rid of parentheses

1v-51+42=0

We add all the numbers together, and all the variables

v-9=0

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

v=9

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