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Gus and Mark collect baseball cards and they keep them in plastic sleeves. Gus has 5 plastic sleeves that are full of cards. Mark has 2 sleeves full of cards and 6 additional cards.
If Gus and Mark have the same number of cards, which equation could be used to find the number of cards in one sleeve?
A.) s + 5 = s + 2 + 6
B.) 5s = 2s - 6
C.) 5s + 6 = 2s
D.) 5s = 2s + 6