evaluate -2 1/5*(1 4/7-5/210)?
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=-21/5*(14/7-5/210)
=21/5*(2/1-1/42)
=21/5*(83/42)
=-1/5*83/2
-83/10
=-8.3
=21/5*(2/1-1/42)
=21/5*(83/42)
=-1/5*83/2
-83/10
=-8.3
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