book Maths Puzzle Numerical Ability

a number decreased by 5?

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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. Clear the Fraction first,if neccesary

7/2x+1/2x=3x+3/2+5/2x