The teacher will be very surprised to see your correct solution 😉
log(3*x) + 4*log(9*x) = 9
sum
5 ___ 9/5
\/ 3 *e
----------
9
=
5 ___ 9/5
\/ 3 *e
----------
9
product
5 ___ 9/5
\/ 3 *e
----------
9
=
5 ___ 9/5
\/ 3 *e
----------
9
3^(1/5)*exp(9/5)/9
5 ___ 9/5
\/ 3 *e
x1 = ----------
9
x1 = 3^(1/5)*exp(9/5)/9