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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.1952 = (209269-x)/x // - (209269-x)/x
0.1952-((209269-x)/x) = 0
(-1*(209269-x))/x+0.1952 = 0
(-1*(209269-x))/x+(0.1952*x)/x = 0
0.1952*x-1*(209269-x) = 0
1.1952*x-209269 = 0
(1.1952*x-209269)/x = 0
(1.1952*x-209269)/x = 0 // * x
1.1952*x-209269 = 0
1.1952*x-209269 = 0 // + 209269
1.1952*x = 209269 // : 1.1952
x = 209269/1.1952
x = 175091.19812584
x = 175091.19812584
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