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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*x // - 3.8*x
0.5-(3.8*x)-((0.2*x)/x) = 0
0.5-3.8*x-0.2 = 0
0.3-3.8*x = 0 // - 0.3
-3.8*x = -0.3 // : -3.8
x = -0.3/(-3.8)
x = 0.07894737
x = 0.07894737
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