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