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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
(10*x+4)/(x-5) = 4 // - 4
(10*x+4)/(x-5)-4 = 0
(10*x+4)/(x-5)+(-4*(x-5))/(x-5) = 0
10*x-4*(x-5)+4 = 0
6*x+24 = 0
(6*x+24)/(x-5) = 0
(6*x+24)/(x-5) = 0 // * x-5
6*x+24 = 0
6*x+24 = 0 // - 24
6*x = -24 // : 6
x = -24/6
x = -4
x = -4
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