Решите пожалуйста  уровнение  ( а + 3  4/7  )  -  1 2 / 7 = 4 3 /7 ,  2 19 /23  - ( 5/ 23  + д  ) = 1 6/23 , ( с - 2 3/11 )  + 5 1 /11 =7 , 3 4 /9  +  ( 8 - в  ) = 6 5 /9

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