Verify (2/5+-3/7)+(-7/10)=2/5+[-3/7+(-7/10)]
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(2/5-3/7)+(-7/10)=2/5+[-3/7+(-7/10)]
(2/5-3/7)-7/10=2/5+[-3/7-7/10]
(14-15/35)-7/10=2/5+[-30-49/70]
1/35-7/10=2/5-79/70
-10-245/350=140-395
-255=-255
(2/5-3/7)-7/10=2/5+[-3/7-7/10]
(14-15/35)-7/10=2/5+[-30-49/70]
1/35-7/10=2/5-79/70
-10-245/350=140-395
-255=-255
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