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D( x )
(7/8)*x <= 0
(7/8)*x <= 0
(7/8)*x <= 0
7/8*x+0 <= 0 // - 0
7/8*x <= 0 // : 7/8
x <= 0/7/8
x <= 0
x in (0:+oo)
12*ln((7/8)*x) = 108 // - 108
12*ln((7/8)*x)-108 = 0
12*ln((7/8)*x)-108 = 0 // + 108
12*ln((7/8)*x) = 108 // : 12
ln((7/8)*x) = 108/12
ln((7/8)*x) = 9
ln((7/8)*x) = ln(e^9)
(7/8)*x = e^9
(7/8)*x-e^9 = 0
7/8*x-e^9 = 0 // + e^9
7/8*x = e^9 // : 7/8
x = (e^9)/7/8
x = 8/7*e^9
x = 8/7*e^9
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