Does this help? If it doesn't i can try to explain more if you want.
Hey! I'll provide you the answers!
First you want to simplify the equation using cross-multiplication.

Finally, you would want to divide both sides by 15.
n = 161
you basically want to get x on it's own to find out what it equals so,
multiply both sides by 9:
x+2 = 45
take away 2 from both sides:
x = 43