add 3xy + 5yz , 2xy - 2yz , -4 xy +5yz
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Answer:
(3xy + 5yz ) + ( 2xy - 2yz ) + ( -4xy + 5yz )
3xy+5yz+2xy-2yz-4xy+5yz
= 3xy-4xy+2xy+5yz-2yz+5yz
= xy-2yz
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