Question: could someone show me how to solve the these functions and correctly write them in interval notation? please show steps the answers aren't any good

could someone show me how to solve the these functions and correctly write them in interval notation? please show steps the answers aren't any good to me without knowing how to actually solve the problem. I am not sure what is missing? the question confused me as well this was all that was given I AM NOT USING THIS TO CHEAT I DONT UNDERSTAND THE QUESTION OR HOW TO CORRECTLY SOLVE IT THE NUMBERS 7 OR 8 CAN BE CHANGED I JUST NEED TO SEE HOW TO SOLVE THIS CORRECTLY

the domain of f(x)= x+7/x-8 is all real numbers except

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