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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
12.5 = 100/v // - 100/v
12.5-(100/v) = 0
12.5-100*v^-1 = 0
-100*v^-1 = -12.5 // : -100
v^-1 = 0.125
-1 < 0
1/(v^1) = 0.125 // * v^1
1 = 0.125*v^1 // : 0.125
8 = v^1
v = 8
v = 8
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