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