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2 1 (2*5) + 2 (4*1) + 1 12 5
2 ------ + 1 ------- = -------------- + -------------- = --------- + ------
5 4 5 4 5 4
12 5 (4*12) + (5*5) 48 + 25 73 13
----- + ----- = --------------------- = -------------- = ------- = 3 --------
5 4 20 20 20 20