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= 4a - 4b -2a - 2b - 3a+ 3b
=4a-2a-3a-4b-2b+6b
=-a
1.p (q - r) + q ( r - p) + r (p-q)
pq - pr + qr - qp + rp - pq
2.4 (a - b) - 2 (a + b) - 3 (a - 2b)
4a - 4b - 2a + 2b - 3a - (-6b)
4a - 2a - 3a - 4b + 2b + 6b
-a + 4b