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D( x )
12-(8*x) = 0
12-(8*x) = 0
12-(8*x) = 0
12-8*x = 0
12-8*x = 0 // - 12
-8*x = -12 // : -8
x = -12/(-8)
x = 3/2
x in (-oo:3/2) U (3/2:+oo)
1/(12-(8*x)) = -5 // + 5
1/(12-(8*x))+5 = 0
1/(12-8*x)+5 = 0
1/(12-8*x)+(5*(12-8*x))/(12-8*x) = 0
5*(12-8*x)+1 = 0
61-40*x = 0
(61-40*x)/(12-8*x) = 0
(61-40*x)/(12-8*x) = 0 // * 12-8*x
61-40*x = 0
61-40*x = 0 // - 61
-40*x = -61 // : -40
x = -61/(-40)
x = 61/40
x = 61/40
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