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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
50/3 = 5280/x // - 5280/x
50/3-(5280/x) = 0
50/3-5280*x^-1 = 0
-5280*x^-1 = -50/3 // : -5280
x^-1 = 5/1584
-1 < 0
1/(x^1) = 5/1584 // * x^1
1 = 5/1584*x^1 // : 5/1584
1584/5 = x^1
x = 1584/5
x = 1584/5
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