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D( x )
x-500 = 0
x-500 = 0
x-500 = 0
x-500 = 0 // + 500
x = 500
x in (-oo:500) U (500:+oo)
6.15 = (3*x+29000000)/(x-500) // - (3*x+29000000)/(x-500)
6.15-((3*x+29000000)/(x-500)) = 0
(-1*(3*x+29000000))/(x-500)+6.15 = 0
(-1*(3*x+29000000))/(x-500)+(6.15*(x-500))/(x-500) = 0
6.15*(x-500)-1*(3*x+29000000) = 0
3.15*x-29003075 = 0
(3.15*x-29003075)/(x-500) = 0
(3.15*x-29003075)/(x-500) = 0 // * x-500
3.15*x-29003075 = 0
3.15*x-29003075 = 0 // + 29003075
3.15*x = 29003075 // : 3.15
x = 29003075/3.15
x = 9207325.3968254
x = 9207325.3968254
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