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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
480/x-(1/2) = 480/x+4 // - 480/x+4
480/x-(480/x)-(1/2)-4 = 0
480/x-480*x^-1-1/2-4 = 0
-9/2 = 0
x belongs to the empty set
x belongs to the empty set
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