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D( x )
x-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:6) U (6:+oo)
(9*x^2-(53*x)-6)/(x-6) = 0
(9*x^2-53*x-6)/(x-6) = 0
9*x^2-53*x-6 = 0
9*x^2-53*x-6 = 0
DELTA = (-53)^2-(-6*4*9)
DELTA = 3025
DELTA > 0
x = (3025^(1/2)+53)/(2*9) or x = (53-3025^(1/2))/(2*9)
x = 6 or x = -1/9
(x+1/9)*(x-6) = 0
x+1/9 = 0
x+1/9 = 0 // - 1/9
x = -1/9
x = -1/9
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