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21=-v+206
We move all terms to the left:
21-(-v+206)=0
We add all the numbers together, and all the variables
-(-1v+206)+21=0
We get rid of parentheses
1v-206+21=0
We add all the numbers together, and all the variables
v-185=0
We move all terms containing v to the left, all other terms to the right
v=185
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