3(х-9)+5(х-4)=1
3х-27+5х-20=1
3х+5х=1+27+20
8х=48
х=48:8
х=6
3:3,6,9,12,15,18....
7:7,14,21,28,......
НОК(3;7)=21
4:4,8,12,16,2024......
5:5,10,15,20,25,.......
НОК(4;5)=20
6:6,12,18,24....
12:12,24,36,48.....
НОК(6;12)=12
4:4,8,12,16,20.....
6:6,12,18.....
НОК (4;6)=12