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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
10/7 = 4/v // - 4/v
10/7-(4/v) = 0
10/7-4*v^-1 = 0
-4*v^-1 = -10/7 // : -4
v^-1 = 5/14
-1 < 0
1/(v^1) = 5/14 // * v^1
1 = 5/14*v^1 // : 5/14
14/5 = v^1
v = 14/5
v = 14/5
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