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D( x )
1-(2*x) = 0
1-(2*x) = 0
1-(2*x) = 0
1-2*x = 0
1-2*x = 0 // - 1
-2*x = -1 // : -2
x = -1/(-2)
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
2.5 = (2*x)/(1-(2*x)) // - (2*x)/(1-(2*x))
2.5-((2*x)/(1-(2*x))) = 0
2.5-2*x*(1-2*x)^-1 = 0
(-2*x)/(1-2*x)+2.5 = 0
(-2*x)/(1-2*x)+(2.5*(1-2*x))/(1-2*x) = 0
2.5*(1-2*x)-2*x = 0
2.5-7*x = 0
(2.5-7*x)/(1-2*x) = 0
(2.5-7*x)/(1-2*x) = 0 // * 1-2*x
2.5-7*x = 0
2.5-7*x = 0 // - 2.5
-7*x = -2.5 // : -7
x = -2.5/(-7)
x = 0.35714286
x = 0.35714286
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