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D( x )
4*x = 0
x-1 = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:0) U (0:1) U (1:+oo)
(10-x)/(4*x) = 1/(x-1) // - 1/(x-1)
(10-x)/(4*x)-(1/(x-1)) = 0
(10-x)/(4*x)-(x-1)^-1 = 0
(10-x)/(4*x)-1/(x-1) = 0
((10-x)*(x-1))/(4*x*(x-1))+(-1*4*x)/(4*x*(x-1)) = 0
(10-x)*(x-1)-1*4*x = 0
7*x-x^2-10 = 0
7*x-x^2-10 = 0
7*x-x^2-10 = 0
DELTA = 7^2-(-10*(-1)*4)
DELTA = 9
DELTA > 0
x = (9^(1/2)-7)/(-1*2) or x = (-9^(1/2)-7)/(-1*2)
x = 2 or x = 5
(x-2)*(x-5) = 0
((x-2)*(x-5))/(4*x*(x-1)) = 0
((x-2)*(x-5))/(4*x*(x-1)) = 0 // * 4*x*(x-1)
(x-2)*(x-5) = 0
( x-2 )
x-2 = 0 // + 2
x = 2
( x-5 )
x-5 = 0 // + 5
x = 5
x in { 2, 5 }
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