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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
13/5 = 9/v // - 9/v
13/5-(9/v) = 0
13/5-9*v^-1 = 0
-9*v^-1 = -13/5 // : -9
v^-1 = 13/45
-1 < 0
1/(v^1) = 13/45 // * v^1
1 = 13/45*v^1 // : 13/45
45/13 = v^1
v = 45/13
v = 45/13
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