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(a) Add:p(-9),q(9-r) and r(r-p)(b) Add: 2x (z - x - y) and 2y (z - y - x)(c) 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+c) |
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