Can you try to put it more in order?
Answer:
15
Step-by-step explanation:
using the rule of exponents
= 
=
=
= 15
Step-by-step explanation:

Collect like terms and simplify
[tex] -10n+30n=-36-24 \\ 20n = -60 [/tex]
Divide both sides of the equation by 20
[tex] 20n/20 = -60/20 \\ n=-3 [/tex]