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b) 3/20 -5/12 = 36-100/240 = -64/240 = 8/30
c) 2/3 - (1/2-1/3) = 2/3 - 1/3 = 6-3/9 = 3/9 = 1/3
d) 2-(-1/3) + 2/5= 6-1/3= 5/3 + 2/5 = 25+6/15 = 31/15