8х+у=27 у=27-8х 3х-(27-8х)=19 3х-27+8х=19 11х=46 х=4 2/11
3х-у=19 у=-6 5/11
<span>(17n+12m-14p)-(11m-10n-14p)=<span>17n+12m-14p-11m+10n+14p=27n+m</span></span>