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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 8/80 // - 8/80
5/x-(8/80) = 0
5/x-1/10 = 0
5*x^-1 = 1/10 // : 5
x^-1 = 1/50
-1 < 0
1/(x^1) = 1/50 // * x^1
1 = 1/50*x^1 // : 1/50
50 = x^1
x = 50
x = 50
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