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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 7/24 // - 7/24
5/x-(7/24) = 0
5/x-7/24 = 0
5*x^-1 = 7/24 // : 5
x^-1 = 7/120
-1 < 0
1/(x^1) = 7/120 // * x^1
1 = 7/120*x^1 // : 7/120
120/7 = x^1
x = 120/7
x = 120/7
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