Выполните действия -
  ( 7 1/9 - 6 7/12) : 19 + 5,5 * 2/11

Решите уравнение -
   ( 3 1/7х + 5 1/2) * 1 7/11= 21


 ОЧЕНЬ НАДО, ЗАРАНЕЕ СПАСИБООО! 
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