If you subtract 5 from 2, you get negative 3 (-3).
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5A-2
n/2 - 7
A rational number is any number which can be expressed as the ratio of two integers (including the integers themselves in this definition). So any number which is more than 2 and less than 3, and which can also be expressed finitely, is a rational number. 2¼, 2½, 2¾ 2 plus any fraction (less than one) will fit your bill.
3*(n - 5) = 2*n + 11
4 is a composite number (2 x 2), and it is less than 5.