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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = -3/18 // + -3/18
5/x-(-3/18) = 0
5/x+1/6 = 0
5*x^-1 = -1/6 // : 5
x^-1 = -1/30
-1 < 0
1/(x^1) = -1/30 // * x^1
1 = -1/30*x^1 // : -1/30
-30 = x^1
x = -30
x = -30
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