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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
50/6 = 18/x // - 18/x
50/6-(18/x) = 0
50/6-18*x^-1 = 0
-18*x^-1 = -25/3 // : -18
x^-1 = 25/54
-1 < 0
1/(x^1) = 25/54 // * x^1
1 = 25/54*x^1 // : 25/54
54/25 = x^1
x = 54/25
x = 54/25
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