Ответ:
{х+у=70=>{х=70-у=70-у+у=16
{х+у=16 ;; -у+у=16-70
-у=-54
у=54
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Ответ:
{х+у=70=>{х=70-у=70-у+у=16
{х+у=16 ;; -у+у=16-70
-у=-54
у=54