@@lovelineswirri4162 Small amounts of study every day is the best way to start. Also try to identify the things you don't understand and then make a plan to solve this. There are lots of RU-vid channels for different levels of ability, so lots of help is available.
3y means 3*y. Therefore 3y/2 is the same as 3/2*y. You can test this on your calculator. For example, if y=4 then (3*4)/2=6 and (3/2)*4=6. Hope this helps.