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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
(10*120)/(x-2) = 80 // - 80
(10*120)/(x-2)-80 = 0
1200/(x-2)-80 = 0
1200/(x-2)+(-80*(x-2))/(x-2) = 0
1200-80*(x-2) = 0
1360-80*x = 0
(1360-80*x)/(x-2) = 0
(1360-80*x)/(x-2) = 0 // * x-2
1360-80*x = 0
1360-80*x = 0 // - 1360
-80*x = -1360 // : -80
x = -1360/(-80)
x = 17
x = 17
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