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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-6 = 45 // - 45
3/x-45-6 = 0
3*x^-1 = 51 // : 3
x^-1 = 17
-1 < 0
1/(x^1) = 17 // * x^1
1 = 17*x^1 // : 17
1/17 = x^1
x = 1/17
x = 1/17
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