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Digital Substitution

digital substitution
Answers:
1054-624 = 5492
1489-239 = 1250
1674-354 = 1320
1678-358 = 1320
1698-348 = 1350
1859-429 = 1430
2685-315 = 2370
3862-412 = 3450
5298-138 = 5160
5692-382 = 5310

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