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