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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
7.87 = 98.375/v // - 98.375/v
7.87-(98.375/v) = 0
7.87-98.375*v^-1 = 0
-98.375*v^-1 = -7.87 // : -98.375
v^-1 = 0.08
-1 < 0
1/(v^1) = 0.08 // * v^1
1 = 0.08*v^1 // : 0.08
12.5 = v^1
v = 12.5
v = 12.5
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