17.
(3a2 - 2ab + 3b2) - (-a2 - 5ab + 3b2)
18.
5c - [8c - (6 - 3c) ]
19.
10x + [3x - (5x - 4) ]
20.
3x 2 - [7x - (4x - x2) + 3]
21.
x2 - [ - 3x + (4 - 7x) ]
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