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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
75/x-75 = 5 // - 5
75/x-75-5 = 0
75*x^-1 = 80 // : 75
x^-1 = 16/15
-1 < 0
1/(x^1) = 16/15 // * x^1
1 = 16/15*x^1 // : 16/15
15/16 = x^1
x = 15/16
x = 15/16
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