Answer:
More info please
Step-by-step explanation:
3: terms/ 12, 8r, -3, s, -5, 15t coefficients/ 8r, 1s, 15t
Hey there!
The answer to your question is 
Given:

First, we distribute the negative sign to both terms (
) This would make the
negative and the
positive, so we have:

Add them together and we get:

Have a nice day!