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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
29 = (1836-x)/x // - (1836-x)/x
29-((1836-x)/x) = 0
(-1*(1836-x))/x+29 = 0
(-1*(1836-x))/x+(29*x)/x = 0
29*x-1*(1836-x) = 0
30*x-1836 = 0
(30*x-1836)/x = 0
(30*x-1836)/x = 0 // * x
30*x-1836 = 0
30*x-1836 = 0 // + 1836
30*x = 1836 // : 30
x = 1836/30
x = 306/5
x = 306/5
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