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D( x )
x-5 = 0
x = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x = 0
x = 0
x in (-oo:0) U (0:5) U (5:+oo)
6/(x-5) = 4/x // - 4/x
6/(x-5)-(4/x) = 0
6/(x-5)-4*x^-1 = 0
6/(x-5)-4/x = 0
(6*x)/(x*(x-5))+(-4*(x-5))/(x*(x-5)) = 0
6*x-4*(x-5) = 0
2*x+20 = 0
(2*x+20)/(x*(x-5)) = 0
(2*x+20)/(x*(x-5)) = 0 // * x*(x-5)
2*x+20 = 0
2*x+20 = 0 // - 20
2*x = -20 // : 2
x = -20/2
x = -10
x = -10
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