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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) = 0
12*ln((7/8)*x) = 0 // : 12
ln((7/8)*x) = 0
ln((7/8)*x) = ln(e^0)
(7/8)*x = e^0
(7/8)*x-e^0 = 0
7/8*x-1 = 0 // + 1
7/8*x = 1 // : 7/8
x = 1/7/8
x = 8/7
x = 8/7
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