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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
5/v = 2/7.5 // - 2/7.5
5/v-(2/7.5) = 0
5/v-0.26666667 = 0
5*v^-1 = 0.26666667 // : 5
v^-1 = 0.05333333
-1 < 0
1/(v^1) = 0.05333333 // * v^1
1 = 0.05333333*v^1 // : 0.05333333
18.75000117 = v^1
v = 18.75000117
v = 18.75000117
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