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D( d )
d = 0
d-3 = 0
d = 0
d = 0
d-3 = 0
d-3 = 0
d-3 = 0 // + 3
d = 3
d in (-oo:0) U (0:3) U (3:+oo)
1/d-((1/3)/(d-3)) = 0
(-1/3)*(d-3)^-1+1/d = 0
1/d-1/3/(d-3) = 0
(-1/3*d)/(d*(d-3))+(1*(d-3))/(d*(d-3)) = 0
1*(d-3)-1/3*d = 0
2/3*d-3 = 0
(2/3*d-3)/(d*(d-3)) = 0
(2/3*d-3)/(d*(d-3)) = 0 // * d*(d-3)
2/3*d-3 = 0
2/3*d-3 = 0 // + 3
2/3*d = 3 // : 2/3
d = 3/2/3
d = 9/2
d = 9/2
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