(3k -4r -2m)2 - (3k + 4r - 2m)2
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(3k - 4r - 2m)2 - (3k + 4r - 2m)2
(6k - 8r - 4m) - (6k + 8r - 4m)
6k - 8r - 4m - 6k - 8r + 4m
-16r
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