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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
720/x-38 = 0
720*x^-1 = 38 // : 720
x^-1 = 19/360
-1 < 0
1/(x^1) = 19/360 // * x^1
1 = 19/360*x^1 // : 19/360
360/19 = x^1
x = 360/19
x = 360/19
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