PLEASE HELP I WILL MARK YOU BRAINIEST!!

Mathematics

1 answer:

Keith_Richards [23]3 years ago

5 0

Answer:
r = 9

The error happened when -3 was multiplied by -r in the first step, negative and negative makes a positive so it should have been
-18 + 3r= 9 in the second step.
Hope this helps :)

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