book Maths Puzzle Numerical Ability

1. 5x + 3 = 23
- 3 -3
then if that is right what do i do when iv done that?

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book Other Question

Identify the inverse of the function f(x)= 2x-4 I have no clue how to do this problem, so can you do it and then i can see how you got the answer? x2-y2/(x-y)2 x 1/x+y