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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/48 = 7/x // - 7/x
18/48-(7/x) = 0
18/48-7*x^-1 = 0
-7*x^-1 = -3/8 // : -7
x^-1 = 3/56
-1 < 0
1/(x^1) = 3/56 // * x^1
1 = 3/56*x^1 // : 3/56
56/3 = x^1
x = 56/3
x = 56/3
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