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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)
0.22 = 0.2/(1-x) // - 0.2/(1-x)
0.22-(0.2/(1-x)) = 0
0.22-0.2*(1-x)^-1 = 0
0.22-0.2/(1-x) = 0
(0.22*(1-x))/(1-x)-0.2/(1-x) = 0
0.22*(1-x)-0.2 = 0
0.02-0.22*x = 0
(0.02-0.22*x)/(1-x) = 0
(0.02-0.22*x)/(1-x) = 0 // * 1-x
0.02-0.22*x = 0
0.02-0.22*x = 0 // - 0.02
-0.22*x = -0.02 // : -0.22
x = -0.02/(-0.22)
x = 0.09090909
x = 0.09090909
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