(3x+5x)×18=144; (7y-3y)÷8=17; (6a+a)÷13=14; 48÷(9b-b)=2

(3х+5х)*18=144
8х * 18 = 144
8х=144 :18
8х = 8
х=8:8
х=1

(7у-3у):8=17
4у :8=17
4у= 8*17
4у=136
у=136:4
у= 34

(6а+а) :13=14
7а :13 = 14
7а = 13*14
7а=182
а = 26

48: (9ь - ь) = 2
48 : 8ь = 2
8ь = 48:2
8ь = 24
ь = 24:8
ь=3