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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(40-(20*x))/x+0.19 = 0
(40-20*x)/x+0.19 = 0
(40-20*x)/x+(0.19*x)/x = 0
0.19*x-20*x+40 = 0
40-19.81*x = 0
(40-19.81*x)/x = 0
(40-19.81*x)/x = 0 // * x
40-19.81*x = 0
40-19.81*x = 0 // - 40
-19.81*x = -40 // : -19.81
x = -40/(-19.81)
x = 2.01918223
x = 2.01918223
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