Decode the cryptogram by using the inverse of A in Exercises 49-52. 1. 20 17 15 12

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Decode the cryptogram by using the inverse of A in Exercises 49-52.
1. 20 17 −15 −12 −56 −104 1 −25 −65 62 143 181
2. 13 −9 −59 61 112 106 −17 −73 −131 11 24 29 65 144 172
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