give some sums to work out on algebraic identities
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4. (a) Subtract 4a – 7ab + 3b + 12
from 12a – 9ab + 5b – 3
(b) Subtract 3xy + 5yz – 7zx
from 5xy – 2yz – 2zx + 10xyz
(c) Subtract 4p2q – 3pq + 5pq2 – 8p + 7q – 10
from 18 – 3p – 11q + 5pq – 2pq2 + 5p2q.
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