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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.5-((0.2*x)/x) = 3.8 // - 3.8
0.5-((0.2*x)/x)-3.8 = 0
0.5-3.8-0.2 = 0
-3.5 = 0
x belongs to the empty set
x belongs to the empty set
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