Name the property used in 2/5 +(3/4 + 1/7) = (2/5 +3/4 )+ 1/7
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2/5+(3/4+1/7)=(2/5+3/4)+1/7
=2/5+(21+4/28)=(8+15/20)+1/7
=2/5+25/28=23/20+1/7
=56+125/140=161+20/140
=181/140=181/140
=1.2928571=1.2928571
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