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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
20/19 = 120/v // - 120/v
20/19-(120/v) = 0
20/19-120*v^-1 = 0
-120*v^-1 = -20/19 // : -120
v^-1 = 1/114
-1 < 0
1/(v^1) = 1/114 // * v^1
1 = 1/114*v^1 // : 1/114
114 = v^1
v = 114
v = 114
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