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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
3/v-5 = 7/2 // - 7/2
3/v-(7/2)-5 = 0
3/v-7/2-5 = 0
3*v^-1 = 17/2 // : 3
v^-1 = 17/6
-1 < 0
1/(v^1) = 17/6 // * v^1
1 = 17/6*v^1 // : 17/6
6/17 = v^1
v = 6/17
v = 6/17
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