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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
13/v = 7/17 // - 7/17
13/v-(7/17) = 0
13/v-7/17 = 0
13*v^-1 = 7/17 // : 13
v^-1 = 7/221
-1 < 0
1/(v^1) = 7/221 // * v^1
1 = 7/221*v^1 // : 7/221
221/7 = v^1
v = 221/7
v = 221/7
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