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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)
(0.1/(x-5))/5 = 4 // - 4
(0.1/(x-5))/5-4 = 0
0.1/(5*(x-5))-4 = 0
0.1/(5*(x-5))+(-4*5*(x-5))/(5*(x-5)) = 0
0.1-4*5*(x-5) = 0
100.1-20*x = 0
(100.1-20*x)/(5*(x-5)) = 0
(100.1-20*x)/(5*(x-5)) = 0 // * 5*(x-5)
100.1-20*x = 0
100.1-20*x = 0 // - 100.1
-20*x = -100.1 // : -20
x = -100.1/(-20)
x = 5.005
x = 5.005
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