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D( x )
5-(4*x) = 0
5-(4*x) = 0
5-(4*x) = 0
5-4*x = 0
5-4*x = 0 // - 5
-4*x = -5 // : -4
x = -5/(-4)
x = 5/4
x in (-oo:5/4) U (5/4:+oo)
(3*(5-(4*x))^-1)/2 = 0
(3*(5-4*x)^-1)/2 = 0
3/(2*(5-4*x)) = 0
3 = 0
x belongs to the empty set
x belongs to the empty set
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