Решить! зараннее уравнения: 11/18-14/27x=5/12 1/3x+1/4x+1/5x=1 19/75

11/18-14/27x=5/12
11/18-14/27х=5/12
14/27х=11/18-5/12=(66-45)/108=21/108=7/36
14/27х=7/36
х=7/36:14/27=7/36*27/14=3/8
х=3/8

1/3x+1/4x+1/5x=1 19/75
1/3+1/4+1/5=(20+15+12)/60=47/60
47/60х=1 19/75=94/75
х=94/75:47/60=94/75*60/47=12/15=4/5
х=4/5