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D( x )
2*x-1 = 0
x-1 = 0
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1/2) U (1/2:1) U (1:+oo)
4/(2*x-1) = 2*(4/(x-1)) // - 2*(4/(x-1))
4/(2*x-1)-(2*(4/(x-1))) = 0
4/(2*x-1)-8*(x-1)^-1 = 0
4/(2*x-1)-8/(x-1) = 0
(4*(x-1))/((2*x-1)*(x-1))+(-8*(2*x-1))/((2*x-1)*(x-1)) = 0
4*(x-1)-8*(2*x-1) = 0
4-12*x = 0
(4-12*x)/((2*x-1)*(x-1)) = 0
(4-12*x)/((2*x-1)*(x-1)) = 0 // * (2*x-1)*(x-1)
4-12*x = 0
4-12*x = 0 // - 4
-12*x = -4 // : -12
x = -4/(-12)
x = 1/3
x = 1/3
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