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D( x )
0.162*x+1 = 0
0.162*x+1 = 0
0.162*x+1 = 0
0.162*x+1 = 0 // - 1
0.162*x = -1 // : 0.162
x = -1/0.162
x = -6.17283951
x in (-oo:-6.17283951) U (-6.17283951:+oo)
2.768/(0.162*x+1) = 0.75 // - 0.75
2.768/(0.162*x+1)-0.75 = 0
2.768/(0.162*x+1)+(-0.75*(0.162*x+1))/(0.162*x+1) = 0
2.768-0.75*(0.162*x+1) = 0
2.018-0.1215*x = 0
(2.018-0.1215*x)/(0.162*x+1) = 0
(2.018-0.1215*x)/(0.162*x+1) = 0 // * 0.162*x+1
2.018-0.1215*x = 0
2.018-0.1215*x = 0 // - 2.018
-0.1215*x = -2.018 // : -0.1215
x = -2.018/(-0.1215)
x = 16.6090535
x = 16.6090535
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