book Maths Puzzle Numerical Ability

I am having trouble with a problem, I think I found the answer but, I am not sure. My question is Solve the subtraction problem 8/9 - 3/4? I think the answer is 5/36? Am I right, Please let me know.

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here is another one I have no clue about..
3/x+5=3/3x-2
If you could show how you did it I just might be able to understand it
Thanks A ladder is resting against a wall. The top of the ladder touches the wall at a height of 15 feet. Find the length of the ladder if the length is 5 feet more than its distance fr