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|-1 5 3|
|1 -7 1|
3 |5 3| -2|-1 3| +1|-1 3|
|-7 1| |1 1| |1 1|
3[5(1)-3(-7)]-2[-1(1)-3(1)]+1[-1(1)-3(1)]
3[5+21]-2[-1-3]+[-1-3]
3[26]+2+6-1-3=82//