За (2b + 5c)+Зc (2а + 2b)
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#За (2b + 5c)+Зc (2а + 2b)
=> 6ab + 15ac + 6 ac + 6 bc
=> 6ab + 21 ac + 6 bc
=> 3( 2ab + 7 ac + 2 bc) <= IS YOUR ANS.
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