5/7+1/7(5+1/2)
= 5/7+ 5/7 + 1/14
=5/14+1/14
=6/14
=3/7
2/3 / 5/6 - 2/5
=12/3 /5 -2/5
=4/5 -2/5
= 2/5
=0.4
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