2 answers:
R=21. 21/3=7. To check your answer, you can do 7x3 and it'll equal 21.
Are you just trying to isolate the r?
If so.... r/3 = 7
Multiply 3 on both sides to clear the denominator
3(r/3) = 7(3)
3 = 21
CHECK
21/3 = 7
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