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D( x )
0.05*x = 0
0.05*x = 0
0.05*x = 0
0.05*x = 0 // : 0.05
x = 0
x in (-oo:0) U (0:+oo)
(2-x)/(0.05*x)+1 = 0.81 // - 0.81
(2-x)/(0.05*x)-0.81+1 = 0
(2-x)/(0.05*x)+(-0.81*0.05*x)/(0.05*x)+(0.05*1*x)/(0.05*x) = 0
0.05*1*x-x-0.81*0.05*x+2 = 0
0.05*x-1.0405*x+2 = 0
2-0.9905*x = 0
(2-0.9905*x)/(0.05*x) = 0
(2-0.9905*x)/(0.05*x) = 0 // * 0.05*x
2-0.9905*x = 0
2-0.9905*x = 0 // - 2
-0.9905*x = -2 // : -0.9905
x = -2/(-0.9905)
x = 2.01918223
x = 2.01918223
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