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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(0.6*x+19)/x = 0.2 // - 0.2
(0.6*x+19)/x-0.2 = 0
(0.6*x+19)/x+(-0.2*x)/x = 0
0.6*x-0.2*x+19 = 0
0.4*x+19 = 0
(0.4*x+19)/x = 0
(0.4*x+19)/x = 0 // * x
0.4*x+19 = 0
0.4*x+19 = 0 // - 19
0.4*x = -19 // : 0.4
x = -19/0.4
x = -47.5
x = -47.5
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