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D( x )
2*x-16 = 0
2*x-16 = 0
2*x-16 = 0
2*x-16 = 0 // + 16
2*x = 16 // : 2
x = 16/2
x = 8
x in (-oo:8) U (8:+oo)
240/(2*x-16) = 8 // - 8
240/(2*x-16)-8 = 0
240/(2*x-16)+(-8*(2*x-16))/(2*x-16) = 0
240-8*(2*x-16) = 0
368-16*x = 0
(368-16*x)/(2*x-16) = 0
(368-16*x)/(2*x-16) = 0 // * 2*x-16
368-16*x = 0
368-16*x = 0 // - 368
-16*x = -368 // : -16
x = -368/(-16)
x = 23
x = 23
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