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D( x )
1-(0.7*x) = 0
1-(0.7*x) = 0
1-(0.7*x) = 0
1-0.7*x = 0
1-0.7*x = 0 // - 1
-0.7*x = -1 // : -0.7
x = -1/(-0.7)
x = 1.42857143
x in (-oo:1.42857143) U (1.42857143:+oo)
(0.7*x)/(1-(0.7*x)) = 0.13 // - 0.13
(0.7*x)/(1-(0.7*x))-0.13 = 0
(0.7*x)/(1-0.7*x)-0.13 = 0
(0.7*x)/(1-0.7*x)+(-0.13*(1-0.7*x))/(1-0.7*x) = 0
0.7*x-0.13*(1-0.7*x) = 0
0.791*x-0.13 = 0
(0.791*x-0.13)/(1-0.7*x) = 0
(0.791*x-0.13)/(1-0.7*x) = 0 // * 1-0.7*x
0.791*x-0.13 = 0
0.791*x-0.13 = 0 // + 0.13
0.791*x = 0.13 // : 0.791
x = 0.13/0.791
x = 0.16434893
x = 0.16434893
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