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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
25/30 = 16/x // - 16/x
25/30-(16/x) = 0
25/30-16*x^-1 = 0
-16*x^-1 = -5/6 // : -16
x^-1 = 5/96
-1 < 0
1/(x^1) = 5/96 // * x^1
1 = 5/96*x^1 // : 5/96
96/5 = x^1
x = 96/5
x = 96/5
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