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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 = 6/(x-1) // - 6/(x-1)
x-(6/(x-1)) = 0
x-6*(x-1)^-1 = 0
x-6/(x-1) = 0
(x*(x-1))/(x-1)-6/(x-1) = 0
x*(x-1)-6 = 0
x^2-x-6 = 0
x^2-x-6 = 0
x^2-x-6 = 0
DELTA = (-1)^2-(-6*1*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)+1)/(1*2) or x = (1-25^(1/2))/(1*2)
x = 3 or x = -2
(x+2)*(x-3) = 0
((x+2)*(x-3))/(x-1) = 0
((x+2)*(x-3))/(x-1) = 0 // * x-1
(x+2)*(x-3) = 0
( x+2 )
x+2 = 0 // - 2
x = -2
( x-3 )
x-3 = 0 // + 3
x = 3
x in { -2, 3 }
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