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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
7/v = 8/5 // - 8/5
7/v-(8/5) = 0
7/v-8/5 = 0
7*v^-1 = 8/5 // : 7
v^-1 = 8/35
-1 < 0
1/(v^1) = 8/35 // * v^1
1 = 8/35*v^1 // : 8/35
35/8 = v^1
v = 35/8
v = 35/8
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