exam Maths Puzzle Numerical Ability

Please to find the inverse function of f in f(x)=3x+1
Thanks

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exam Other Question

A common mistake when solving equations is the following:
The equation: 2(x-2) = x + 3
First step in solving: 2x- 2= x + 3

How do I write a explanation of what error has been made. What could be done to
avoid this error? algebraic method to solve

5(x+3)=15x-6