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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15 = 96/x // - 96/x
15-(96/x) = 0
15-96*x^-1 = 0
-96*x^-1 = -15 // : -96
x^-1 = 5/32
-1 < 0
1/(x^1) = 5/32 // * x^1
1 = 5/32*x^1 // : 5/32
32/5 = x^1
x = 32/5
x = 32/5
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