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D( x )
x-78 = 0
37/(x-78) <= 0
x-78 = 0
x-78 = 0
x-78 = 0 // + 78
x = 78
37/(x-78) <= 0
37/(x-78) <= 0
( 37 )
37 <= 0
x belongs to the empty set
( x-78 )
x-78 <= 0 // + 78
x <= 78
(-oo:78) (78:+oo) 37 + + x-78 - +
x in (78:+oo)
ln(37/(x-78)) = 0
ln(37/(x-78)) = ln(e^0)
37/(x-78) = e^0
37/(x-78)-e^0 = 0
37/(x-78)-1 = 0
37/(x-78)+(-1*(x-78))/(x-78) = 0
37-1*(x-78) = 0
115-x = 0
(115-x)/(x-78) = 0
(115-x)/(x-78) = 0 // * x-78
115-x = 0
115-x = 0 // - 115
-x = -115 // * -1
x = 115
x = 115
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