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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x+6)/x = 5/4 // - 5/4
(x+6)/x-(5/4) = 0
(x+6)/x-5/4 = 0
(4*(x+6))/(4*x)+(-5*x)/(4*x) = 0
4*(x+6)-5*x = 0
24-x = 0
(24-x)/(4*x) = 0
(24-x)/(4*x) = 0 // * 4*x
24-x = 0
24-x = 0 // - 24
-x = -24 // * -1
x = 24
x = 24
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