15a ×4
60a
3b-12
3(b-4)
17a×5
85a
11a×5
55a
21d-18d+3
(21-18)d+3
3d+3
14a+a+9+4
15a+13
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15a ×4
60a
3b-12
3(b-4)
17a×5
85a
11a×5
55a
21d-18d+3
(21-18)d+3
3d+3
14a+a+9+4
15a+13