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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x+12)/x = 3/2 // - 3/2
(x+12)/x-(3/2) = 0
(x+12)/x-3/2 = 0
(2*(x+12))/(2*x)+(-3*x)/(2*x) = 0
2*(x+12)-3*x = 0
24-x = 0
(24-x)/(2*x) = 0
(24-x)/(2*x) = 0 // * 2*x
24-x = 0
24-x = 0 // - 24
-x = -24 // * -1
x = 24
x = 24
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