Question

8
$\leqslant$
3r+1
$\leqslant$
13



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Answer 1

8 ≤ 3r+1 ≤ 13

8-1 ≤ 3r+1 - 1 ≤ 13-1

7 ≤ 3r ≤ 12

7/3 ≤ 3r/3 ≤ 12/3

7/3 ≤ r ≤ 4

Answer 2

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