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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
360/x-4 = 360/x-3 // - 360/x-3
360/x-(360/x)-4+3 = 0
360/x-360*x^-1-4+3 = 0
-1 = 0
x belongs to the empty set
x belongs to the empty set
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