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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
54/x = 10/5 // - 10/5
54/x-(10/5) = 0
54/x-2 = 0
54*x^-1 = 2 // : 54
x^-1 = 1/27
-1 < 0
1/(x^1) = 1/27 // * x^1
1 = 1/27*x^1 // : 1/27
27 = x^1
x = 27
x = 27
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