Answer:
34a^2 + 21a - 20
Explanation:
(12a^2 + 6a -8) - (-22a + 12 - 15a)
12a^2 + 6a - 8 + 22a + 12 - 15a
34^2 + 6a - 8 - 12 + 15a
34^2 + 21a - 20
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