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Veronika936495459
1) 10у-5х+3у+9у=22у-5х
2)4а-(7а-5)=4а-7а+5=5-3а
3)7а-b+(2b-9a)= 7a-b+2b-9a=b-2a
4)13-5(p-4)=13-5p+20=33-5p

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