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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/32 = (12-x)/x // - (12-x)/x
16/32-((12-x)/x) = 0
(-1*(12-x))/x+1/2 = 0
(-1*2*(12-x))/(2*x)+(1*x)/(2*x) = 0
1*x-1*2*(12-x) = 0
3*x-24 = 0
(3*x-24)/(2*x) = 0
(3*x-24)/(2*x) = 0 // * 2*x
3*x-24 = 0
3*x-24 = 0 // + 24
3*x = 24 // : 3
x = 24/3
x = 8
x = 8
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