13. xy - lyz - zx - {yx - (3y - xz) - (xy - zy)
}
14. 2a - 3b - [3a - 2b - {a-C-(a - 2b)
15. -a -la + {a + b - 2a - (a - b)}- b]
16. 2a - [4b - {4a - (3b - 2a + 2b)
17. 5x - [4y - {7x - (32 - 2y) + 4z - 3(x + 3y - 2z)}}
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