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D( x )
x-5 = 0
x+5 = 0
x = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x = 0
x = 0
x in (-oo:-5) U (-5:0) U (0:5) U (5:+oo)
(11/x)*(5/(x+5)-(5/(x-5))) = 0
(11/x)*(5/(x+5)-5*(x-5)^-1) = 0
11*x^-1*(5/(x+5)-5/(x-5)) = 0
5/(x+5)-5/(x-5) = 0
(5*(x-5))/((x+5)*(x-5))+(-5*(x+5))/((x+5)*(x-5)) = 0
5*(x-5)-5*(x+5) = 0
-50 = 0
-50/((x+5)*(x-5)) = 0
-50/((x+5)*(x-5)) = 0 // * (x+5)*(x-5)
-50 = 0
-50*11*x^-1 = 0
11*x^-1 = 0 // : 11
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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