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D( x )
6*x-x^2 = 0
6*x-x^2 = 0
6*x-x^2 = 0
6*x-x^2 = 0
DELTA = 6^2-(-1*0*4)
DELTA = 36
DELTA > 0
x = (36^(1/2)-6)/(-1*2) or x = (-36^(1/2)-6)/(-1*2)
x = 0 or x = 6
x in (-oo:0) U (0:6) U (6:+oo)
(6-(2*x))/(6*x-x^2) = 0
(6-2*x)/(6*x-x^2) = 0
6*x-x^2 = 0
x*(6-x) = 0
6-x = 0 // - 6
-x = -6 // * -1
x = 6
x*(x-6) = 0
(6-2*x)/(x*(x-6)) = 0
6-2*x = 0 // - 6
-2*x = -6 // : -2
x = -6/(-2)
x = 3
x = 3
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