Final answer:
To find DE, use the equation DE = 10x - 4.
Step-by-step explanation:
To find DE, we can use the given equation DF = 10x - 4.
Since the picture is not provided, we cannot determine the value of x or the relationship between DE and DF directly, but we can still solve for DE in terms of x.
So, the equation for DE would be:
DE = 10x - 4