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D( x )
x+281 = 0
x+281 = 0
x+281 = 0
x+281 = 0 // - 281
x = -281
x in (-oo:-281) U (-281:+oo)
(0.046*281)/(x+281) = 0.039 // - 0.039
(0.046*281)/(x+281)-0.039 = 0
12.926/(x+281)-0.039 = 0
12.926/(x+281)+(-0.039*(x+281))/(x+281) = 0
12.926-0.039*(x+281) = 0
1.967-0.039*x = 0
(1.967-0.039*x)/(x+281) = 0
(1.967-0.039*x)/(x+281) = 0 // * x+281
1.967-0.039*x = 0
1.967-0.039*x = 0 // - 1.967
-0.039*x = -1.967 // : -0.039
x = -1.967/(-0.039)
x = 50.43589744
x = 50.43589744
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