Simple...
you have:

and

To solve for....

Multiply to remove the denominator-->>

n=12*3
n=36
Then-->>>

Do the same thing-->>

n=-12*3
n=-36
Thus, your answer.
Answer:
17. m=-1/2
18. m=-1
Step-by-step explanation:
9n - 2 - 6n - 3
(9n + -6n) + (-2+-3)
=3n -5