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D( x )
21.8694-(3.81*x) = 0
21.8694-(3.81*x) = 0
21.8694-(3.81*x) = 0
21.8694-3.81*x = 0
21.8694-3.81*x = 0 // - 21.8694
-3.81*x = -21.8694 // : -3.81
x = -21.8694/(-3.81)
x = 5.74
x in (-oo:5.74) U (5.74:+oo)
0.7834 = (21.8694-(5.74*x))/(21.8694-(3.81*x)) // - (21.8694-(5.74*x))/(21.8694-(3.81*x))
0.7834-((21.8694-(5.74*x))/(21.8694-(3.81*x))) = 0
0.7834-((21.8694-5.74*x)/(21.8694-3.81*x)) = 0
(-1*(21.8694-5.74*x))/(21.8694-3.81*x)+0.7834 = 0
(-1*(21.8694-5.74*x))/(21.8694-3.81*x)+(0.7834*(21.8694-3.81*x))/(21.8694-3.81*x) = 0
0.7834*(21.8694-3.81*x)-1*(21.8694-5.74*x) = 0
2.755246*x-4.73691204 = 0
(2.755246*x-4.73691204)/(21.8694-3.81*x) = 0
(2.755246*x-4.73691204)/(21.8694-3.81*x) = 0 // * 21.8694-3.81*x
2.755246*x-4.73691204 = 0
2.755246*x-4.73691204 = 0 // + 4.73691204
2.755246*x = 4.73691204 // : 2.755246
x = 4.73691204/2.755246
x = 1.7192338
x = 1.7192338
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