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=8/3+2/15-(-6/3)
=(40+2+30)/15
=72/15
=24/5
40) -7/4+2/5-(-1/4)
-7/4+2/5+1/4=(-35+8+5)/20=-22/20=-11/10
41) 4/3+(-1/9)-24/27
4/3-1/9-8/9=(12-1-8)/9=3/9=1/3