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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(12*x)/(x^2) = 5/2 // - 5/2
(12*x)/(x^2)-(5/2) = 0
(12*x)/(x^2)-5/2 = 0
12*x^-1 = 5/2 // : 12
x^-1 = 5/24
-1 < 0
1/(x^1) = 5/24 // * x^1
1 = 5/24*x^1 // : 5/24
24/5 = x^1
x = 24/5
x = 24/5
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