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Solve the following.
1. a(a - b-c) + b(a + b -c) - c(-a + b + c)
2. 4xy (x - y - y2) – 2x²y
3. 2(x – 3) + 3(4 – 2x)-1
4. m(m + n) - n(m – n) + 2mn
5. 2pg (p – 9-1)-p? (q + 1) -pq (2-p)
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