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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
80/5 = 10/x // - 10/x
80/5-(10/x) = 0
80/5-10*x^-1 = 0
-10*x^-1 = -16 // : -10
x^-1 = 8/5
-1 < 0
1/(x^1) = 8/5 // * x^1
1 = 8/5*x^1 // : 8/5
5/8 = x^1
x = 5/8
x = 5/8
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