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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
110/360 = 50/x // - 50/x
110/360-(50/x) = 0
110/360-50*x^-1 = 0
-50*x^-1 = -11/36 // : -50
x^-1 = 11/1800
-1 < 0
1/(x^1) = 11/1800 // * x^1
1 = 11/1800*x^1 // : 11/1800
1800/11 = x^1
x = 1800/11
x = 1800/11
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