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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
1-5*(12-8*x) = 0
40*x-59 = 0
(40*x-59)/(12-8*x) = 0
(40*x-59)/(12-8*x) = 0 // * 12-8*x
40*x-59 = 0
40*x-59 = 0 // + 59
40*x = 59 // : 40
x = 59/40
x = 59/40
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