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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
8/v = 7/5 // - 7/5
8/v-(7/5) = 0
8/v-7/5 = 0
8*v^-1 = 7/5 // : 8
v^-1 = 7/40
-1 < 0
1/(v^1) = 7/40 // * v^1
1 = 7/40*v^1 // : 7/40
40/7 = v^1
v = 40/7
v = 40/7
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