Hey!
Hope this helps...
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In order to find out this question we have to separate this equation into its individual parts...
(12f-8g+3fh)-(4f-g+5h) splits into:
12f - 4f = 8f
-8g - g = -9g
3h - 5h = -2h
So now we have to put this all together...
8f - 9g - 2h is the answer!