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21.3-6v=2.1
We move all terms to the left:
21.3-6v-(2.1)=0
We add all the numbers together, and all the variables
-6v+19.2=0
We move all terms containing v to the left, all other terms to the right
-6v=-19.2
v=-19.2/-6
v=3+1/5
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