book Maths Puzzle Numerical Ability

Hi Tutors:
I am studying "Functions and Graphs." Can you please show me step by step how to find the domain? PROBLEM: f(x)=7/5-x (5-x is the denominator). Thanks in advance.

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Please help solve this equation. I am a parent trying to understand what I need to explain. 5-1/2(x-6)=4. How do you compute the intercepts of a quadratic function? If someone is answering this question, would you please also give an example of how you would compute it? Thanks so very