my prof posted the answers and his is different than mine, any step by step help to show what i'm doing wrong?

his answer = $\displaystyle \frac{(-ln x -2)}{x^2}$

"find the antiderivative":

$\displaystyle

f(x) = \frac{1}{x} (lnx + 3)$

i tried using substitution

$\displaystyle

u = lnx + 3$

$\displaystyle h(u) = \frac{1}{x} u $

$\displaystyle

= \frac{1}{x} (lnx + 3) $

.....stuck.