If the question is supposed to be 
Now multiply both sides by 3 to get 3(-21)=-63=e
Now multiply both sides by 3 to get 3(-21)=-63=e
R < 37 or r ≥ 42 r < 37 or r > 42 37 < r ≥ 42 37 > r ≥ 42 ???????
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