I hope I can help!
So, first if all, you have to combine like terms.
You can use shaped to help you combine the like terms.
So, it would be -9x + 12x then 7 - 15
-9x + 12x = 3x
7 - 15 = 8
3x - 8
Example:
5x + 6x + 7 + 7
Combine like terms
5x + 6x = 11x
7+7=14
11x + 14 would be your answer
Have a great day/evening/night! :)
Let me know if you have any additional questions!
-Kappifilms
