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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
x-(14/(x-1)) = 4-((2*x)/(x-1)) // - 4-((2*x)/(x-1))
(2*x)/(x-1)-(14/(x-1))+x-4 = 0
(2*x)/(x-1)-14*(x-1)^-1+x-4 = 0
(2*x)/(x-1)-14/(x-1)+x-4 = 0
(2*x)/(x-1)-14/(x-1)+(x*(x-1))/(x-1)+(-4*(x-1))/(x-1) = 0
x*(x-1)-4*(x-1)+2*x-14 = 0
x^2+2*x-x-4*x-14+4 = 0
x^2+x-4*x-14+4 = 0
x^2-3*x-10 = 0
x^2-3*x-10 = 0
x^2-3*x-10 = 0
DELTA = (-3)^2-(-10*1*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+3)/(1*2) or x = (3-49^(1/2))/(1*2)
x = 5 or x = -2
(x+2)*(x-5) = 0
((x+2)*(x-5))/(x-1) = 0
((x+2)*(x-5))/(x-1) = 0 // * 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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