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D( x )
8-(4*x) = 0
8-(4*x) = 0
8-(4*x) = 0
8-4*x = 0
8-4*x = 0 // - 8
-4*x = -8 // : -4
x = -8/(-4)
x = 2
x in (-oo:2) U (2:+oo)
(2-(5*x))/(8-(4*x)) = 0
(2-5*x)/(8-4*x) = 0
2-5*x = 0 // - 2
-5*x = -2 // : -5
x = -2/(-5)
x = 2/5
x = 2/5
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