Explanation:
For nø. 7
5(m + 3) + 2(m + 8)
= 5m + 15 + 2m + 16
= 7m + 31
For nø 8
9(x + 2) + 4(5 + x)
= 9x + 18 + 20 + 4x
= 13x + 38
Hope it will help :)
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