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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
30093/x = 185 // - 185
30093/x-185 = 0
30093*x^-1 = 185 // : 30093
x^-1 = 185/30093
-1 < 0
1/(x^1) = 185/30093 // * x^1
1 = 185/30093*x^1 // : 185/30093
30093/185 = x^1
x = 30093/185
x = 30093/185
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