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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/100 = 244/x // - 244/x
15/100-(244/x) = 0
15/100-244*x^-1 = 0
-244*x^-1 = -3/20 // : -244
x^-1 = 3/4880
-1 < 0
1/(x^1) = 3/4880 // * x^1
1 = 3/4880*x^1 // : 3/4880
4880/3 = x^1
x = 4880/3
x = 4880/3
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