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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)
x/(1-x) = 0.065 // - 0.065
x/(1-x)-0.065 = 0
x/(1-x)+(-0.065*(1-x))/(1-x) = 0
x-0.065*(1-x) = 0
1.065*x-0.065 = 0
(1.065*x-0.065)/(1-x) = 0
(1.065*x-0.065)/(1-x) = 0 // * 1-x
1.065*x-0.065 = 0
1.065*x-0.065 = 0 // + 0.065
1.065*x = 0.065 // : 1.065
x = 0.065/1.065
x = 0.06103286
x = 0.06103286
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