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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
5/v = 7/4 // - 7/4
5/v-(7/4) = 0
5/v-7/4 = 0
5*v^-1 = 7/4 // : 5
v^-1 = 7/20
-1 < 0
1/(v^1) = 7/20 // * v^1
1 = 7/20*v^1 // : 7/20
20/7 = v^1
v = 20/7
v = 20/7
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