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=1 3/5- (5/8*8/10+ 1 3/5):2=
=1 3/5- (1/2+ 1 3/5):2=
=1 3/5-(5/10+ 16/10):2=
=1 3/5-(21/10):2=
=1 3/5- 21/10*1/2=
=1 3/5- 21/20=
=32/20- 21/20= 11/20