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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
2-(5/v)+6 = -4/v-1 // + -4/v-1
1-(5/v)-(-4/v)+2+6 = 0
4*v^-1-5*v^-1+1+2+6 = 0
-1*v^-1 = -9 // : -1
v^-1 = 9
-1 < 0
1/(v^1) = 9 // * v^1
1 = 9*v^1 // : 9
1/9 = v^1
v = 1/9
v = 1/9
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