Answer:
13a + 15b + 18
Explanation:
5(a + 3b) = 5a + 15b
So the question is: 5a + 15b + 6 + 8a + 12
5a + 8a = 13a
15b stays the same
6 + 12 = 18
So the answer is 13a + 15b + 18
5(a + 3b) + 6 + 8a + 12
5a + 15b + 6 + 8a + 12
(5a + 8a) + 15b + (6+12)
Hope this helps!
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