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D( X )
X+8 = 0
X+8 = 0
X+8 = 0
X+8 = 0 // - 8
X = -8
X in (-oo:-8) U (-8:+oo)
X/(X+8) = 0.999 // - 0.999
X/(X+8)-0.999 = 0
X/(X+8)+(-0.999*(X+8))/(X+8) = 0
X-0.999*(X+8) = 0
0.001*X-7.992 = 0
(0.001*X-7.992)/(X+8) = 0
(0.001*X-7.992)/(X+8) = 0 // * X+8
0.001*X-7.992 = 0
0.001*X-7.992 = 0 // + 7.992
0.001*X = 7.992 // : 0.001
X = 7.992/0.001
X = 7992
X = 7992
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