(3a4 + 8a3 + 9a2) - (2a4 - 3a3 + 6a2)
(12a+24a+18)-(8a-9a+12a)
(54a)-11a
54a-11a=43a
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(3a4 + 8a3 + 9a2) - (2a4 - 3a3 + 6a2)
(12a+24a+18)-(8a-9a+12a)
(54a)-11a
54a-11a=43a