Answer :

First Way
5(2) + 7(3) - 3(2) + 3(3) + 4 =
10 + 21 - 6 + 9 + 4 =
31 - 6 + 9 + 4 =
25 + 9 + 4 =
34 + 4 =
38
Second Way
5r + 7s - 3(r + s) + 4 =
5r + 7s - 3r + 3s + 4 =
2r + 10s + 4 =
2(2) + 10(3) + 4 =
4 + 30 + 4 =
38

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