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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/x = -2 // + 2
18/x+2 = 0
18*x^-1 = -2 // : 18
x^-1 = -1/9
-1 < 0
1/(x^1) = -1/9 // * x^1
1 = -1/9*x^1 // : -1/9
-9 = x^1
x = -9
x = -9
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