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The first customer paid 12 for 14 postcards and 5 large envelopes The second customer paid 24 80 for 10 postcards and 15 large envelopes

The first customer paid 12 for 14 postcards and 5 large envelopes The second customer paid 24 80 for 10 postcards and 15 large envelopes What was the cost in dollars of each large envelope

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