3[5a+3a{4+2(2a+3a-4b+8)}]
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3
3[8a[6(5a-4b+8)}]
3[8a[30a-24b+48]
+30a-24b-48
54a-24b+48
2(27-12+24)
2(15+24)
2(39)
78
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