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D( x )
1-(5*x) = 0
x-9 = 0
1-(5*x) = 0
1-(5*x) = 0
1-5*x = 0
1-5*x = 0 // - 1
-5*x = -1 // : -5
x = -1/(-5)
x = 1/5
x-9 = 0
x-9 = 0
x-9 = 0 // + 9
x = 9
x in (-oo:1/5) U (1/5:9) U (9:+oo)
(6*x-7)/(1-(5*x)) = (x-3)/(x-9) // - (x-3)/(x-9)
(6*x-7)/(1-(5*x))-((x-3)/(x-9)) = 0
(6*x-7)/(1-5*x)-((x-3)/(x-9)) = 0
(6*x-7)/(1-5*x)+(-1*(x-3))/(x-9) = 0
((6*x-7)*(x-9))/((1-5*x)*(x-9))+(-1*(x-3)*(1-5*x))/((1-5*x)*(x-9)) = 0
(6*x-7)*(x-9)-1*(x-3)*(1-5*x) = 0
11*x^2-77*x+66 = 0
11*x^2-77*x+66 = 0
11*(x^2-7*x+6) = 0
x^2-7*x+6 = 0
DELTA = (-7)^2-(1*4*6)
DELTA = 25
DELTA > 0
x = (25^(1/2)+7)/(1*2) or x = (7-25^(1/2))/(1*2)
x = 6 or x = 1
11*(x-1)*(x-6) = 0
(11*(x-1)*(x-6))/((1-5*x)*(x-9)) = 0
(11*(x-1)*(x-6))/((1-5*x)*(x-9)) = 0 // * (1-5*x)*(x-9)
11*(x-1)*(x-6) = 0
( x-1 )
x-1 = 0 // + 1
x = 1
( x-6 )
x-6 = 0 // + 6
x = 6
x in { 1, 6 }
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