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D( x )
7*x <= 0
7*x <= 0
7*x <= 0
7*x+0 <= 0 // - 0
7*x <= 0 // : 7
x <= 0/7
x <= 0
x in (0:+oo)
ln(7*x)/3 = 0
1/3*ln(7*x) = 0 // : 1/3
ln(7*x) = 0
ln(7*x) = ln(e^0)
7*x = e^0
7*x-e^0 = 0
7*x-1 = 0 // + 1
7*x = 1 // : 7
x = 1/7
x = 1/7
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