Your answer is D 6m5+9m4-3m3 hope this helps
Answer:
brainly.com/question/1820178
This is the same question as yours. There is a good explanation to it as well. Copy and paste it into your browser if you can't click it.
First you need to distribute the 9.
So 9 times 3 and 9 times 2
The Algebraic should look like now: (27^3x-18)
So the final answer is: 
You cannot simplify it anymore because there are <u>no like terms left.</u>