14 9/16- x =6 3/4+1 2/5
14 9/16 - х = 6 3/4 + 1 2/5 14 9/16 - 6 3/4 - 1 2/5 = х 233/16 - 27/4 - 7/5 = х 1165/80 - 540/80 - 112/80 = х х = 513/80 х = 6 33/80
спасибо