exam Maths Puzzle Numerical Ability

If f(x)=square root of x-1 find f-1(x)

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exam Other Question

I understand simple absolute value, but I don't understand it when it is an equation. The problem is:
|x+2/5|=1/5

How do you figure it out, and then when you graph it on a num (3/2x-2)+(1/2)=2/x-1