Answer:
c
Step-by-step explanation:

Rewrite -1 as a fraction

Cross multiply

Distribute the -1

Add both sides by ax

Subtract both sides by 3

Divide both sides by 3a

Simplify

That's the value of x respect to a. Let me know if you need any clarifications, thanks!
Rounded to the nearest tenth would be 0.8
5 x 9/10
Answer=
5x9
10
Cut 5 with 10 as it’s possible
5 x 1 =5 and 5x 2=10
So the answer is
9/2