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The correct equation that can be used to find the amount of change, x, that Carmen receives is x = 10 - 3.74.
To find out the amount of change, we subtract the cost of the snack ($3.74) from the amount of money she gives to the cashier ($10).
Therefore, Carmen receives $6.26 in change.
So the correct answer is: x - 3.74 = 10; Carmen receives $6.26 in change.