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D( x )
4*x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
(12*x^2-(16*x))/(4*x) = 0
(12*x^2-16*x)/(4*x) = 0
12*x^2-16*x = 0
4*x*(3*x-4) = 0
3*x-4 = 0 // + 4
3*x = 4 // : 3
x = 4/3
4*x*(x-4/3) = 0
x-4/3 = 0
x-4/3 = 0 // + 4/3
x = 4/3
x = 4/3
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