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D( X )
X+102 = 0
X+102 = 0
X+102 = 0
X+102 = 0 // - 102
X = -102
X in (-oo:-102) U (-102:+oo)
(X+91)/(X+102) = 0.9 // - 0.9
(X+91)/(X+102)-0.9 = 0
(X+91)/(X+102)+(-0.9*(X+102))/(X+102) = 0
X-0.9*(X+102)+91 = 0
0.1*X-0.8 = 0
(0.1*X-0.8)/(X+102) = 0
(0.1*X-0.8)/(X+102) = 0 // * X+102
0.1*X-0.8 = 0
0.1*X-0.8 = 0 // + 0.8
0.1*X = 0.8 // : 0.1
X = 0.8/0.1
X = 8
X = 8
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