Mathematics, 05.12.2019 18:31 annette211pdd8v9

Marty and stewart are stuffing envelopes with index cards. they are putting x index cards in each envelope. when they are finished, marty has 15 envelopes and 4 extra index cards and stewart has 12 stuffed envelopes and 6 extra index cards. write an expression in standard form that represents the number of index cards the boys started with.

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Marty and stewart are stuffing envelopes with index cards. they are putting x index cards in each en...

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