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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
273/x+88 = 38 // - 38
273/x-38+88 = 0
273*x^-1 = -50 // : 273
x^-1 = -50/273
-1 < 0
1/(x^1) = -50/273 // * x^1
1 = -50/273*x^1 // : -50/273
-273/50 = x^1
x = -273/50
x = -273/50
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