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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)
608/(1-x) = 1025 // - 1025
608/(1-x)-1025 = 0
608/(1-x)+(-1025*(1-x))/(1-x) = 0
608-1025*(1-x) = 0
1025*x-417 = 0
(1025*x-417)/(1-x) = 0
(1025*x-417)/(1-x) = 0 // * 1-x
1025*x-417 = 0
1025*x-417 = 0 // + 417
1025*x = 417 // : 1025
x = 417/1025
x = 417/1025
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