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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 15/x+60 // - 15/x+60
8/x-(15/x)-60 = 0
8/x-15*x^-1-60 = 0
-7*x^-1 = 60 // : -7
x^-1 = -60/7
-1 < 0
1/(x^1) = -60/7 // * x^1
1 = -60/7*x^1 // : -60/7
-7/60 = x^1
x = -7/60
x = -7/60
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