It is simply 5a+15. Since you don't know what 'a' is, you cannot add them.
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2a + 5a + 3a = 10a
5a + 20 = ? Your question is incomplete.
6b+5a-4b+3a= ? Rearrange it as 5a+3a+6b-4b = 8a+2b
7a + 4 = 5a + 7 7a = 5a + 3 2a = 3 a = 3/2
3a4 - 2a2 + 5a - 10 - 2a4 + 4a2 + 5a - 2 = a4 + 2a2 + 10a - 12 = a4 + (2a - 2)(a + 6)