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D( d )
d+3 = 0
2*d-3 = 0
d+3 = 0
d+3 = 0
d+3 = 0 // - 3
d = -3
2*d-3 = 0
2*d-3 = 0
2*d-3 = 0 // + 3
2*d = 3 // : 2
d = 3/2
d in (-oo:-3) U (-3:3/2) U (3/2:+oo)
5/(2*d-3) = 10/(d+3) // - 10/(d+3)
5/(2*d-3)-(10/(d+3)) = 0
5/(2*d-3)-10*(d+3)^-1 = 0
5/(2*d-3)-10/(d+3) = 0
(5*(d+3))/((2*d-3)*(d+3))+(-10*(2*d-3))/((2*d-3)*(d+3)) = 0
5*(d+3)-10*(2*d-3) = 0
45-15*d = 0
(45-15*d)/((2*d-3)*(d+3)) = 0
(45-15*d)/((2*d-3)*(d+3)) = 0 // * (2*d-3)*(d+3)
45-15*d = 0
45-15*d = 0 // - 45
-15*d = -45 // : -15
d = -45/(-15)
d = 3
d = 3
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