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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
11/13 = 4/v // - 4/v
11/13-(4/v) = 0
11/13-4*v^-1 = 0
-4*v^-1 = -11/13 // : -4
v^-1 = 11/52
-1 < 0
1/(v^1) = 11/52 // * v^1
1 = 11/52*v^1 // : 11/52
52/11 = v^1
v = 52/11
v = 52/11
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