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a)(1/21+1/14)-(1/35-1/42)+(1/14-1/21)

b) (4 1/6-1 1/9)-(11/8-7/24)+(1/10+1/15

c) (7/16+17/5-1/40)-(5/8-3/5)

d) (5/12-3/18)-4+1/11+(4/3-1)•3​