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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)
1/x-(2/(x-5)) = 0
1/x-2*(x-5)^-1 = 0
1/x-2/(x-5) = 0
(-2*x)/(x*(x-5))+(1*(x-5))/(x*(x-5)) = 0
1*(x-5)-2*x = 0
-x-5 = 0
(-x-5)/(x*(x-5)) = 0
(-x-5)/(x*(x-5)) = 0 // * x*(x-5)
-x-5 = 0
-x-5 = 0 // + 5
-x = 5 // * -1
x = -5
x = -5
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