a-2/7-(b+1/21)=
a-2/7-b-1/21=
a-b-6/21-1/21=
a-b-7/21
уменьшается на 7/21
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a-2/7-(b+1/21)=
a-2/7-b-1/21=
a-b-6/21-1/21=
a-b-7/21
уменьшается на 7/21