You can put this solution on YOUR website! Hi! You first want to start by distruting your (-) to (+) by adding the (-) to everything in the second equation. SO you would have:
(7f-5g+5h)+(-4f+g+2h) now you add the same variables togather.
(7f-4f)+(-5g+g)+(5h+2h)
so your answer would be:
3f-4g+3h
Hope this helps,
angela