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D( x )
0.5*x = 0
0.1*x = 0
0.5*x = 0
0.5*x = 0
0.5*x = 0 // : 0.5
x = 0
0.1*x = 0
0.1*x = 0
0.1*x = 0 // : 0.1
x = 0
x in (-oo:0) U (0:+oo)
10-(20*(e/(0.1*x)-(e/(0.5*x)))) = 5 // - 5
10-(20*(e/(0.1*x)-(e/(0.5*x))))-5 = 0
10-20*(e/(0.1*x)-2*e*x^-1)-5 = 0
10-20*8*e*x^-1-5 = 0
10-20*8*e*x^-1-5 = 0
10-160*e*x^-1-5 = 0
5-160*e*x^-1 = 0
5-160*e*x^-1 = 0
-160*e*x^-1 = -5 // : -160*e
x^-1 = (e^-1)/32
-1 < 0
1/(x^1) = (e^-1)/32 // * x^1
1 = ((e^-1)/32)*x^1 // : (e^-1)/32
32*e = x^1
x = 32*e
x = 32*e
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