29a - [9a + 2{7a -(6a - 5a + 2a)}]
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29a - [9a + 2{7a -(6a - 5a + 2a)}]
29a - [9a + 2{7a -( a + 2a)}]
29a - [9a + 2{7a -( 3a )}]
29a - [9a + 2{7a - 3a }]
29a - [9a + 2{ 4a }]
29a - [9a + 8a]
29a - [ 17a ]
29a - 17a
12a
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12a answer
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