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197=125-v
We move all terms to the left:
197-(125-v)=0
We add all the numbers together, and all the variables
-(-1v+125)+197=0
We get rid of parentheses
1v-125+197=0
We add all the numbers together, and all the variables
v+72=0
We move all terms containing v to the left, all other terms to the right
v=-72
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