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a) |-7| - |-7| = 7 - 7 = 0
b) |-9| - |+5| = 9 - 5 = 4
c) 6 - |-9| = 6 - 9 = -3
d) |-5| - |-2| = 5 - 2 = 3
e) |-9| - |-7| = 9 - 7 = 2