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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
66/x-8 = 18/15 // - 18/15
66/x-(18/15)-8 = 0
66/x-6/5-8 = 0
66*x^-1 = 46/5 // : 66
x^-1 = 23/165
-1 < 0
1/(x^1) = 23/165 // * x^1
1 = 23/165*x^1 // : 23/165
165/23 = x^1
x = 165/23
x = 165/23
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