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D( x )
x-6 = 0
x = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x = 0
x = 0
x in (-oo:0) U (0:6) U (6:+oo)
5/(x-6) = 2/x // - 2/x
5/(x-6)-(2/x) = 0
5/(x-6)-2*x^-1 = 0
5/(x-6)-2/x = 0
(5*x)/(x*(x-6))+(-2*(x-6))/(x*(x-6)) = 0
5*x-2*(x-6) = 0
3*x+12 = 0
(3*x+12)/(x*(x-6)) = 0
(3*x+12)/(x*(x-6)) = 0 // * x*(x-6)
3*x+12 = 0
3*x+12 = 0 // - 12
3*x = -12 // : 3
x = -12/3
x = -4
x = -4
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