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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
-4 = 5/v-8 // - 5/v-8
8-(5/v)-4 = 0
8-5*v^-1-4 = 0
-5*v^-1 = -4 // : -5
v^-1 = 4/5
-1 < 0
1/(v^1) = 4/5 // * v^1
1 = 4/5*v^1 // : 4/5
5/4 = v^1
v = 5/4
v = 5/4
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