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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) = 0.53 // - 0.53
X/(1-X)-0.53 = 0
X/(1-X)+(-0.53*(1-X))/(1-X) = 0
X-0.53*(1-X) = 0
1.53*X-0.53 = 0
(1.53*X-0.53)/(1-X) = 0
(1.53*X-0.53)/(1-X) = 0 // * 1-X
1.53*X-0.53 = 0
1.53*X-0.53 = 0 // + 0.53
1.53*X = 0.53 // : 1.53
X = 0.53/1.53
X = 0.34640523
X = 0.34640523
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