Ответ:
(2b-y)+(3b-3y+x)=
=2b-y+3b-3y+x =
= 2b+3b-y-3y+x =
= 5b-4y+x.
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Ответ:
(2b-y)+(3b-3y+x)=
=2b-y+3b-3y+x =
= 2b+3b-y-3y+x =
= 5b-4y+x.