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D( x )
x+14 = 0
x+14 = 0
x+14 = 0
x+14 = 0 // - 14
x = -14
x in (-oo:-14) U (-14:+oo)
0.8485 = 28/(x+14) // - 28/(x+14)
0.8485-(28/(x+14)) = 0
0.8485-28*(x+14)^-1 = 0
0.8485-28/(x+14) = 0
(0.8485*(x+14))/(x+14)-28/(x+14) = 0
0.8485*(x+14)-28 = 0
0.8485*x-16.121 = 0
(0.8485*x-16.121)/(x+14) = 0
(0.8485*x-16.121)/(x+14) = 0 // * x+14
0.8485*x-16.121 = 0
0.8485*x-16.121 = 0 // + 16.121
0.8485*x = 16.121 // : 0.8485
x = 16.121/0.8485
x = 18.99941072
x = 18.99941072
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