86[15x-7(6x-9)-2{10x-5(2-3x)}]
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86[15x-7(6x-9)-2{10x-5(2-3x)}86[15x-42x-63-2{10x-10-15x}]
86[-27x-61{5x-10}]
86[-27x-305x-610]
1,806x-26,230x-52,460
24,424x- 52,460
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