Below is an instruction that describes a task. Write a response that appropriately completes the request in French. Please answer in French.

### Instruction:
 Matt has 8 baseball cards worth $6 each. If he trades two of them to Jane in exchange for 3 $2 cards and 1 $9 card, how much profit does he make?


### Response:
 D'abord, trouvez le coût total des 3 cartes de $2 : 3 * $2 = $<<3*2=6>>6
Ensuite, soustrayez le coût des cartes que Matt abandonne du coût des cartes qu'il reçoit pour trouver son profit : $9 - $6 = $<<9-6=3>>3