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1. \((104,2-x)-11,26=13,254\) ;

   \(104,2-x=\) [ ][ \(+\) | \(-\) ][ ];

   \(104,2-x=\) [ ];

   \(x=\) [ ][ \(+\) | \(-\) ][ ];

   \(x=\) [ ].

2. \(51,4-(74,5-y)=47,73\) ;

   \(74,5-y=\) [ ][ \(+\) | \(-\) ][ ];

   \(74,5-y=\) [ ];

   \(y=\) [ ][ \(+\) | \(-\) ][ ];

   \(y=\) [ ].

Ответ.

1. \(x=\) [ ].
2. \(y=\) [ ].