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Manuel and Rita bought CDs at the music store. Rita's CDs originally cost three times more than Manuel's CDs, but she received a $9 discount. If Rita spent $21 total, which equation can be used to fin
Manuel and Rita bought CDs at the music store. Rita's CDs originally cost three times more than Manuel's CDs, but she received a $9 discount. If Rita spent $21 total, which equation can be used to find the amount Manuel spent?