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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
-1.47 = 6.61/v // - 6.61/v
-(6.61/v)-1.47 = 0
-6.61*v^-1-1.47 = 0
-6.61*v^-1 = 1.47 // : -6.61
v^-1 = -0.22239032
-1 < 0
1/(v^1) = -0.22239032 // * v^1
1 = -0.22239032*v^1 // : -0.22239032
-4.49659859 = v^1
v = -4.49659859
v = -4.49659859
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