You can put this solution on YOUR website! Good try at getting the problem to display as you would write it on paper.
I have been working on this website for about a year and do not always get it to show what I want.
I am betting that the problem was not exactly as it shows.
I am betting that the problem was
3loga-logb-(1/2)logc=3loga-logb-(logc)/2 , or
You get to use the following properties of logarithms: , , and =