Not sure what the colon represents but let’s get started on the equation
First thing is to distribute
Y:y-1= 4y-2y-16 —> Y:y-1= 2y-16 plus one on both sides
Then gives you y:y=2y-15
From there I’m not sure bc of that colon which in math normally represents a ratio but that is just implying a one to one ratio or that y is equal to y
If it is there by accident then we will proceed here with the equation
Y=2y-15... subtract 2y from both sides to get -y=-15 , and a negative divided by a negative will give you a positive answer
So with all of that in mind I think your answer is y=15
