No, it doesn't matter. In the end, both will have the answer of 4. Anything inside the absolute value is positive. So if |-5-(-9)| is |4|, then the answer is 4. If |-9-(-5)| is |-4|, then the negative four will turn into a positive four because it is inside the absolute value.
So in the end, both answers are 4 and it doesn't matter in which order the equation is set.
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