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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
360/x = 20 // - 20
360/x-20 = 0
360*x^-1 = 20 // : 360
x^-1 = 1/18
-1 < 0
1/(x^1) = 1/18 // * x^1
1 = 1/18*x^1 // : 1/18
18 = x^1
x = 18
x = 18
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