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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)
200000 = 10/(1-x) // - 10/(1-x)
200000-(10/(1-x)) = 0
200000-10*(1-x)^-1 = 0
200000-10/(1-x) = 0
(200000*(1-x))/(1-x)-10/(1-x) = 0
200000*(1-x)-10 = 0
199990-200000*x = 0
(199990-200000*x)/(1-x) = 0
(199990-200000*x)/(1-x) = 0 // * 1-x
199990-200000*x = 0
199990-200000*x = 0 // - 199990
-200000*x = -199990 // : -200000
x = -199990/(-200000)
x = 19999/20000
x = 19999/20000
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