помогите пжжжж
к-е-2к-2е+3к

5а-6в+6а+3в 21е-11р+е-р

-3у+6х+у-4х 12у-21х+12х-21у

4а+3с-3а-4с 2у-6а-12у+12а

2а-у-3а+2у к-у-к-2у+2к

а-5с-5а+3с -р+2у+3р-(-2у)

3у-(-4а)+2у-3а 2у-6а-12у+12а
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