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D( y )
y = 0
9/y <= 0
y = 0
y = 0
9/y <= 0
9/y <= 0
9*y^-1 <= 0
9*y^-1 <= 0 // : 9
y^-1 <= 0/9
y^-1 <= 0
1/(y^1) <= 0
y <> 0
1/(y^1) <= 0 // * y^2
(y^2)/(y^1) <= 0
y^1 <= 0
y <= 0
y in (-oo:0)
y in (0:+oo)
0.5877 = ln(9/y) // - ln(9/y)
0.5877-ln(9/y) = 0
0.5877-ln(9/y) = 0 // - 0.5877
-ln(9/y) = -0.5877
-ln(9/y) = -0.5877 // * -1
ln(9/y) = ln(e^0.5877)
9/y = e^0.5877
9/y-e^0.5877 = 0
9*y^-1 = e^0.5877 // : 9
y^-1 = (e^0.5877)/9
-1 < 0
1/(y^1) = (e^0.5877)/9 // * y^1
1 = ((e^0.5877)/9)*y^1 // : (e^0.5877)/9
9*e^-0.5877 = y^1
y = 9*e^-0.5877
y = 9*e^-0.5877
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