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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-((x-3920)/x) = 0.22 // - 0.22
1-((x-3920)/x)-0.22 = 0
(-1*(x-3920))/x-0.22+1 = 0
(-1*(x-3920))/x+(-0.22*x)/x+(1*x)/x = 0
1*x-1*(x-3920)-0.22*x = 0
x-1.22*x+3920 = 0
3920-0.22*x = 0
(3920-0.22*x)/x = 0
(3920-0.22*x)/x = 0 // * x
3920-0.22*x = 0
3920-0.22*x = 0 // - 3920
-0.22*x = -3920 // : -0.22
x = -3920/(-0.22)
x = 17818.18181818
x = 17818.18181818
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