Largest Possibility?

Context of your next task = same as it has been for Q1, Q2, & Q3. But see the directions below. They're different!
What is the LARGEST POSSIBLE VALUE FOR D you can create given the constraints of not being able to repeat digits? Show below!
How do you know the value for [math]d[/math] you found is the largest possible value given the constraint of having no repeated digits? What made this task challenging? Explain.
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