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D( d )
d+9 = 0
d+9 = 0
d+9 = 0
d+9 = 0 // - 9
d = -9
d in (-oo:-9) U (-9:+oo)
(4*d+1)/(d+9) = -3/(-2) // + -3/(-2)
(4*d+1)/(d+9)-(-3/(-2)) = 0
(4*d+1)/(d+9)-3/2 = 0
(2*(4*d+1))/(2*(d+9))+(-3*(d+9))/(2*(d+9)) = 0
2*(4*d+1)-3*(d+9) = 0
5*d-25 = 0
(5*d-25)/(2*(d+9)) = 0
(5*d-25)/(2*(d+9)) = 0 // * 2*(d+9)
5*d-25 = 0
5*d-25 = 0 // + 25
5*d = 25 // : 5
d = 25/5
d = 5
d = 5
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