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D( x )
20*x+(8/6)*x = 0
20*x+(8/6)*x = 0
20*x+(8/6)*x = 0
64/3*x = 0 // : 64/3
x = 0
x in (-oo:0) U (0:+oo)
(40*x+16/6)/(20*x+(8/6)*x) = 0
(40*x+8/3)/(64/3*x) = 0
40*x+8/3 = 0 // - 8/3
40*x = -8/3 // : 40
x = -8/3/40
x = -1/15
x = -1/15
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