In general, identical effects are added up before being applied. So if you equip an item giving +50% to all archers, and another giving +25% to all archers, the game just treats that as if you had equipped one item giving +75% to all archers.*
Note that "Attack" isn't the same as damage, by the way. The two are related, but only by a modestly complex equation.
*I know these items don't exist in an un-modded game. But I didn't feel like looking up actual items just for that example.
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