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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-16)/x = 88/100 // - 88/100
(x-16)/x-(88/100) = 0
(x-16)/x-22/25 = 0
(25*(x-16))/(25*x)+(-22*x)/(25*x) = 0
25*(x-16)-22*x = 0
3*x-400 = 0
(3*x-400)/(25*x) = 0
(3*x-400)/(25*x) = 0 // * 25*x
3*x-400 = 0
3*x-400 = 0 // + 400
3*x = 400 // : 3
x = 400/3
x = 400/3
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