6 5/27- (x-1 2/9) = 3 20/81
6 5/27- 3 20/81 = x-1 2/9 6 15/81 - 3 20/81 = x-1 2/9 2 76/81 + 1 2/9 = х х= 2 76/81 + 1 18/81 = 3 94/81 = 4 13/81