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