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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
4/v = 7/13 // - 7/13
4/v-(7/13) = 0
4/v-7/13 = 0
4*v^-1 = 7/13 // : 4
v^-1 = 7/52
-1 < 0
1/(v^1) = 7/52 // * v^1
1 = 7/52*v^1 // : 7/52
52/7 = v^1
v = 52/7
v = 52/7
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