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239=149-v
We move all terms to the left:
239-(149-v)=0
We add all the numbers together, and all the variables
-(-1v+149)+239=0
We get rid of parentheses
1v-149+239=0
We add all the numbers together, and all the variables
v+90=0
We move all terms containing v to the left, all other terms to the right
v=-90
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