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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
19.52 = (209269-x)/x // - (209269-x)/x
19.52-((209269-x)/x) = 0
(-1*(209269-x))/x+19.52 = 0
(-1*(209269-x))/x+(19.52*x)/x = 0
19.52*x-1*(209269-x) = 0
20.52*x-209269 = 0
(20.52*x-209269)/x = 0
(20.52*x-209269)/x = 0 // * x
20.52*x-209269 = 0
20.52*x-209269 = 0 // + 209269
20.52*x = 209269 // : 20.52
x = 209269/20.52
x = 10198.29434698
x = 10198.29434698
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