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Автор - sabinarustamova1

2c-68=78; 4d-58=12; 70+2n=226; 98=n-18.

Ответ

Автор - aleksandrausko
1)2с-68=78
   2с=78+68
   2с=146
   с=73
2)4д-58=12
   4д=58+12
   4д=70
    д=17,5
3)2н=226-70
   2н=156
     н=78
4)-н+18=-98
   -н=-98-18
   -н=-116
     н=116

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