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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/x = 36/28 // - 36/28
18/x-(36/28) = 0
18/x-9/7 = 0
18*x^-1 = 9/7 // : 18
x^-1 = 1/14
-1 < 0
1/(x^1) = 1/14 // * x^1
1 = 1/14*x^1 // : 1/14
14 = x^1
x = 14
x = 14
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