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209=90-v
We move all terms to the left:
209-(90-v)=0
We add all the numbers together, and all the variables
-(-1v+90)+209=0
We get rid of parentheses
1v-90+209=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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