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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x = 550 // - 550
15/x-550 = 0
15*x^-1 = 550 // : 15
x^-1 = 110/3
-1 < 0
1/(x^1) = 110/3 // * x^1
1 = 110/3*x^1 // : 110/3
3/110 = x^1
x = 3/110
x = 3/110
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