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255=139-v
We move all terms to the left:
255-(139-v)=0
We add all the numbers together, and all the variables
-(-1v+139)+255=0
We get rid of parentheses
1v-139+255=0
We add all the numbers together, and all the variables
v+116=0
We move all terms containing v to the left, all other terms to the right
v=-116
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