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 and so that no two digits have the same absolute value? Show below!
How do you know the value for [math]d[/math] you found is the largest possible value? What made this task challenging? Explain. [br]
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