???
THE ANSWER IS NOT 15
The answer is -3.75
Here's how i worked it out:
5(y-3) / 3y =3
multiply out brackets
5y-15 / 3y =3
multiply everything by 3y to remove fraction
5y-15=9y
move y's to one side of the equation
-15=9y-5y
so
4y=-15
then y on its own is
y= -15 / 4
therefore
y=-3.75
If you put 15 in the original equation, you get 1.333, not 3