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