231=140-v

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Solution for 231=140-v equation: 



231=140-v

We move all terms to the left:

231-(140-v)=0

We add all the numbers together, and all the variables

-(-1v+140)+231=0

We get rid of parentheses

1v-140+231=0

We add all the numbers together, and all the variables

v+91=0

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

v=-91

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