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D( x )
136.779-(5.74*x) = 0
136.779-(5.74*x) = 0
136.779-(5.74*x) = 0
136.779-5.74*x = 0
136.779-5.74*x = 0 // - 136.779
-5.74*x = -136.779 // : -5.74
x = -136.779/(-5.74)
x = 23.82909408
x in (-oo:23.82909408) U (23.82909408:+oo)
0.6808 = (136.779-(35.9*x))/(136.779-(5.74*x)) // - (136.779-(35.9*x))/(136.779-(5.74*x))
0.6808-((136.779-(35.9*x))/(136.779-(5.74*x))) = 0
0.6808-((136.779-35.9*x)/(136.779-5.74*x)) = 0
(-1*(136.779-35.9*x))/(136.779-5.74*x)+0.6808 = 0
(-1*(136.779-35.9*x))/(136.779-5.74*x)+(0.6808*(136.779-5.74*x))/(136.779-5.74*x) = 0
0.6808*(136.779-5.74*x)-1*(136.779-35.9*x) = 0
31.992208*x-43.6598568 = 0
(31.992208*x-43.6598568)/(136.779-5.74*x) = 0
(31.992208*x-43.6598568)/(136.779-5.74*x) = 0 // * 136.779-5.74*x
31.992208*x-43.6598568 = 0
31.992208*x-43.6598568 = 0 // + 43.6598568
31.992208*x = 43.6598568 // : 31.992208
x = 43.6598568/31.992208
x = 1.36470283
x = 1.36470283
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