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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
360/x = 16/9 // - 16/9
360/x-(16/9) = 0
360/x-16/9 = 0
360*x^-1 = 16/9 // : 360
x^-1 = 2/405
-1 < 0
1/(x^1) = 2/405 // * x^1
1 = 2/405*x^1 // : 2/405
405/2 = x^1
x = 405/2
x = 405/2
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