138=221-v

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Solution for 138=221-v equation: 



138=221-v

We move all terms to the left:

138-(221-v)=0

We add all the numbers together, and all the variables

-(-1v+221)+138=0

We get rid of parentheses

1v-221+138=0

We add all the numbers together, and all the variables

v-83=0

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

v=83

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