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D( x )
0.24-x = 0
0.24-x = 0
0.24-x = 0
0.24-x = 0 // - 0.24
-x = -0.24 // * -1
x = 0.24
x in (-oo:0.24) U (0.24:+oo)
7.368853371 = (2*x)/(0.24-x) // - (2*x)/(0.24-x)
7.368853371-((2*x)/(0.24-x)) = 0
7.368853371-2*x*(0.24-x)^-1 = 0
(-2*x)/(0.24-x)+7.368853371 = 0
(-2*x)/(0.24-x)+(7.368853371*(0.24-x))/(0.24-x) = 0
7.368853371*(0.24-x)-2*x = 0
1.76852480904-9.368853371*x = 0
(1.76852480904-9.368853371*x)/(0.24-x) = 0
(1.76852480904-9.368853371*x)/(0.24-x) = 0 // * 0.24-x
1.76852480904-9.368853371*x = 0
1.76852480904-9.368853371*x = 0 // - 1.76852480904
-9.368853371*x = -1.76852480904 // : -9.368853371
x = -1.76852480904/(-9.368853371)
x = 0.18876641
x = 0.18876641
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