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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
375/x = 60 // - 60
375/x-60 = 0
375*x^-1 = 60 // : 375
x^-1 = 4/25
-1 < 0
1/(x^1) = 4/25 // * x^1
1 = 4/25*x^1 // : 4/25
25/4 = x^1
x = 25/4
x = 25/4
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