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D( x )
4.56*x = 0
4.56*x = 0
4.56*x = 0
4.56*x = 0 // : 4.56
x = 0
x in (-oo:0) U (0:+oo)
0.6 = (10.8-3)/(4.56*x) // - (10.8-3)/(4.56*x)
0.6-((10.8-3)/(4.56*x)) = 0
0.6-0.21929825*(10.8-3)*x^-1 = 0
-1.71052635*x^-1 = -0.6 // : -1.71052635
x^-1 = 0.35076922
-1 < 0
1/(x^1) = 0.35076922 // * x^1
1 = 0.35076922*x^1 // : 0.35076922
2.85087728 = x^1
x = 2.85087728
x = 2.85087728
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