5x-15-2x=6
3x=21
x=7
Therefore, x must equal 7.
You need to see what you need to convert and how you need to convert it, do you need to divide to find out how many it goes in? Questions like that.
Step-by-step explanation:
r-5r-6s+8s-15
-4r+2s-15
= 2s-4r-15
