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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
35/x = 18 // - 18
35/x-18 = 0
35*x^-1 = 18 // : 35
x^-1 = 18/35
-1 < 0
1/(x^1) = 18/35 // * x^1
1 = 18/35*x^1 // : 18/35
35/18 = x^1
x = 35/18
x = 35/18
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