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D( x )
112-x = 0
59/(112-x) <= 0
112-x = 0
112-x = 0
112-x = 0 // - 112
-x = -112 // * -1
x = 112
59/(112-x) <= 0
59/(112-x) <= 0
( 112-x )
112-x <= 0
-x <= -112 // * -1
x >= 112
( 59 )
59 <= 0
x belongs to the empty set
(-oo:112)(112:+oo)112-x+-59++
x in (-oo:112)
ln(59/(112-x)) = 0
ln(59/(112-x)) = ln(e^0)
59/(112-x) = e^0
59/(112-x)-e^0 = 0
59/(112-x)-1 = 0
59/(112-x)+(-1*(112-x))/(112-x) = 0
59-1*(112-x) = 0
x-53 = 0
(x-53)/(112-x) = 0
(x-53)/(112-x) = 0 // * 112-x
x-53 = 0
x-53 = 0 // + 53
x = 53
x = 53
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