Answer:
(a)
(b) \[12a-9ab+5b-3\] ? \[4a-7ab+4b+12\] ? + ? ? \[8a-2ab+2b-15\]
(c) \[5xy-2yz-2zx+10xyz\] ? \[3xy+5yz-7zx\] ? ? + \[2xy-7yz+5zx+10xyz\]
\[18-3p-11q+5pq-2p{{q}^{2}}+5{{p}^{2}}q\] ? \[-10-8p+7q-3pq+5p{{q}^{2}}+4{{p}^{2}}q\] + + ? + ? ? \[28+5p-18q+8pq-7p{{q}^{2}}+{{p}^{2}}q\]
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