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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)
-20/(x-5) = -10/x // + -10/x
-20/(x-5)-(-10/x) = 0
10*x^-1-20/(x-5) = 0
10/x-20/(x-5) = 0
(-20*x)/(x*(x-5))+(10*(x-5))/(x*(x-5)) = 0
10*(x-5)-20*x = 0
-10*x-50 = 0
(-10*x-50)/(x*(x-5)) = 0
(-10*x-50)/(x*(x-5)) = 0 // * x*(x-5)
-10*x-50 = 0
-10*x-50 = 0 // + 50
-10*x = 50 // : -10
x = 50/(-10)
x = -5
x = -5
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