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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)
(3*x+29000000)/(x-500) = 6.15 // - 6.15
(3*x+29000000)/(x-500)-6.15 = 0
(3*x+29000000)/(x-500)+(-6.15*(x-500))/(x-500) = 0
3*x-6.15*(x-500)+29000000 = 0
29003075-3.15*x = 0
(29003075-3.15*x)/(x-500) = 0
(29003075-3.15*x)/(x-500) = 0 // * x-500
29003075-3.15*x = 0
29003075-3.15*x = 0 // - 29003075
-3.15*x = -29003075 // : -3.15
x = -29003075/(-3.15)
x = 9207325.3968254
x = 9207325.3968254
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