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19.4=9+-2v
We move all terms to the left:
19.4-(9+-2v)=0
We add all the numbers together, and all the variables
-(-2v)+19.4=0
We get rid of parentheses
2v+19.4=0
We move all terms containing v to the left, all other terms to the right
2v=-19.4
v=-19.4/2
v=-9+1/1.4285714285714
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