(30/27 - 1/3)*15/7+2/5=
=(10/9-3/9)*15/7+2/5=
=7/9*15/7+2/5=
=15/9+2/5=5/3+2/5=25/15+6/15=31/15
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(30/27 - 1/3)*15/7+2/5=
=(10/9-3/9)*15/7+2/5=
=7/9*15/7+2/5=
=15/9+2/5=5/3+2/5=25/15+6/15=31/15