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D( x )
925.4-(28*x) = 0
925.4-(28*x) = 0
925.4-(28*x) = 0
925.4-28*x = 0
925.4-28*x = 0 // - 925.4
-28*x = -925.4 // : -28
x = -925.4/(-28)
x = 33.05
x in (-oo:33.05) U (33.05:+oo)
0.8 = (925.4-(33.05*x))/(925.4-(28*x)) // - (925.4-(33.05*x))/(925.4-(28*x))
0.8-((925.4-(33.05*x))/(925.4-(28*x))) = 0
0.8-((925.4-33.05*x)/(925.4-28*x)) = 0
(-1*(925.4-33.05*x))/(925.4-28*x)+0.8 = 0
(-1*(925.4-33.05*x))/(925.4-28*x)+(0.8*(925.4-28*x))/(925.4-28*x) = 0
0.8*(925.4-28*x)-1*(925.4-33.05*x) = 0
10.65*x-185.08 = 0
(10.65*x-185.08)/(925.4-28*x) = 0
(10.65*x-185.08)/(925.4-28*x) = 0 // * 925.4-28*x
10.65*x-185.08 = 0
10.65*x-185.08 = 0 // + 185.08
10.65*x = 185.08 // : 10.65
x = 185.08/10.65
x = 17.37840376
x = 17.37840376
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