4. (a Subtract 4a-7ab + 3b + 12 from 12a-9ab + 5b - 3
(b) Subtract 3xy + 5yz – 7zx from 5xy – 2yz – 2zx + 10xyz
© Subtract 4p²9 – 3pq + 5pq? – 8p +79 - 10 from
18 - 3p - 119 + 5pq-2pq2 + 5p?q
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