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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 1-(2/30) // - 1-(2/30)
8/x+2/30-1 = 0
8*x^-1 = 14/15 // : 8
x^-1 = 7/60
-1 < 0
1/(x^1) = 7/60 // * x^1
1 = 7/60*x^1 // : 7/60
60/7 = x^1
x = 60/7
x = 60/7
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