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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(80*x+5*52+5500)/x = 144 // - 144
(80*x+5*52+5500)/x-144 = 0
(80*x+5760)/x-144 = 0
(80*x+5760)/x+(-144*x)/x = 0
80*x-144*x+5760 = 0
5760-64*x = 0
(5760-64*x)/x = 0
(5760-64*x)/x = 0 // * x
5760-64*x = 0
5760-64*x = 0 // - 5760
-64*x = -5760 // : -64
x = -5760/(-64)
x = 90
x = 90
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