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D( V )
V = 0
V = 0
V = 0
V in (-oo:0) U (0:+oo)
-9 = -6/V // + -6/V
-(-6/V)-9 = 0
6*V^-1-9 = 0
6*V^-1 = 9 // : 6
V^-1 = 3/2
-1 < 0
1/(V^1) = 3/2 // * V^1
1 = 3/2*V^1 // : 3/2
2/3 = V^1
V = 2/3
V = 2/3
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