1/3x+1/4x+1/5x=1 19/75;

41/2:x+13/4=319/28

1/3x+1/4x+1/5x=1 19/75

20+15+12/60 х=1 19/75

47/60 х=1 19/75

х=1 19/75 : 47/60

х=94/75*60/47

х=8/5

х=1 3/5

41/2:x+13/4=319/28

41/2 : х = 319/28-13/4

41/2:х = 319-13*7/28

41/2 : х=228/28

х=41/2:228/28

х=41/2*28/228

х=574/228

х = 2 цел 59/114