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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
340/v = 20 // - 20
340/v-20 = 0
340*v^-1 = 20 // : 340
v^-1 = 1/17
-1 < 0
1/(v^1) = 1/17 // * v^1
1 = 1/17*v^1 // : 1/17
17 = v^1
v = 17
v = 17
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