book Maths Puzzle Numerical Ability

How do you combine like terms like this? -5x+8+7x-11

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book Other Question

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. -200=k+(-99)