Answer:
There are three different answers that are mathematically correct, but I really think answer 1 is the right one.
1)
2)
3)
Hope i could help! If you have any questions, ask them in the comments below!
Have a good day! (●'◡'●)
r = 3
5+3 = 18 (subtract 3 from both sides.
5r = 15 (divide)
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