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D( x )
1-x = 0
1-x = 0
1-x = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x in (-oo:1) U (1:+oo)
(0.33*8)/(1-x) = 0.16 // - 0.16
(0.33*8)/(1-x)-0.16 = 0
2.64/(1-x)-0.16 = 0
2.64/(1-x)+(-0.16*(1-x))/(1-x) = 0
2.64-0.16*(1-x) = 0
0.16*x+2.48 = 0
(0.16*x+2.48)/(1-x) = 0
(0.16*x+2.48)/(1-x) = 0 // * 1-x
0.16*x+2.48 = 0
0.16*x+2.48 = 0 // - 2.48
0.16*x = -2.48 // : 0.16
x = -2.48/0.16
x = -15.5
x = -15.5
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