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5. (a) Add: p(p-9), 9 ( -) and r( -p)(b) Add 2r(-x - y) and 2y (z-y - x)7) Subtract: 31(1 - 4 m + 5 n) from 41( 10 n-3 m +21).d) Subtract: 3a (a + b + c)-2 b (a - b + c) from 4c (-a+b.

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