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+12/60х=1 19/75
47/60х=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