5a2+7a +3 + 12a2 -3a+8 and 16a2- 4a +7
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5a2 + 7a +3 + 12a2 - 3a +8 and 16a2 - 4a + 7
5a2 +16a2 +12a2 -3a +7a - 4a +7 -3
23a2 - 6a + 4
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