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= 2 15/20 -1 4/20
= 1 11/20
2. = -2 8/12 - 3 9/12
= - 32/12 - 45/12
= -77/12
= - 6 5/12
3. = 3 2/4 - 5 3/4
= 2 6/4 - 5 3/4
= -3 3/4