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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x)/x-4 = 45/4 // - 45/4
(5*x)/x-(45/4)-4 = 0
(5*x)/x-45/4-4 = 0
-41/4 = 0
x belongs to the empty set
x belongs to the empty set
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