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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
2/v = 10/4 // - 10/4
2/v-(10/4) = 0
2/v-5/2 = 0
2*v^-1 = 5/2 // : 2
v^-1 = 5/4
-1 < 0
1/(v^1) = 5/4 // * v^1
1 = 5/4*v^1 // : 5/4
4/5 = v^1
v = 4/5
v = 4/5
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