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D( x )
2*x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
(5*x+4)/(2*x) = 8 // - 8
(5*x+4)/(2*x)-8 = 0
(5*x+4)/(2*x)+(-8*2*x)/(2*x) = 0
5*x-8*2*x+4 = 0
4-11*x = 0
(4-11*x)/(2*x) = 0
(4-11*x)/(2*x) = 0 // * 2*x
4-11*x = 0
4-11*x = 0 // - 4
-11*x = -4 // : -11
x = -4/(-11)
x = 4/11
x = 4/11
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