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250=131-v
We move all terms to the left:
250-(131-v)=0
We add all the numbers together, and all the variables
-(-1v+131)+250=0
We get rid of parentheses
1v-131+250=0
We add all the numbers together, and all the variables
v+119=0
We move all terms containing v to the left, all other terms to the right
v=-119
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