(7,4+(-2 1/5))+(3,2+(-1/2))= (37/5-11/5)+(16/5-1/2)=(37/5-11/5)+27/10=26/5+27/10=79/10=7 9/10.
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(7,4+(-2 1/5))+(3,2+(-1/2))= (37/5-11/5)+(16/5-1/2)=(37/5-11/5)+27/10=26/5+27/10=79/10=7 9/10.