How do you do - 19+C/3=8 can someone teach how to solve this problem?

You're looking for c, so you want to isolate it or get it by itself. To get rid of the / 3 you multiply since the opposite of division is multiplication and to get rid of it, you do the opposite (like - 9 you would add 9 to get it to 0). Now you are left with - 19+c = 24 (the 24 is 8*3 because what you do to one side you do to the other. Now you get c by itself so you add 19 to both sides which leaves you with C = 43. Sorry if this was confusing!