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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
25/24-(16/x) = 79/168 // - 79/168
25/24-(16/x)-(79/168) = 0
25/24-16*x^-1-79/168 = 0
-16*x^-1 = -4/7 // : -16
x^-1 = 1/28
-1 < 0
1/(x^1) = 1/28 // * x^1
1 = 1/28*x^1 // : 1/28
28 = x^1
x = 28
x = 28
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