Turn it upside down!
To get the reciprocal of a number, just divide 1 by the number.
If you are given a variable "x", its reciprocal is "1/x".
Likewise, if you are given something more complicated like "x/y" then the reciprocal is just "y/x" (ie, turn it upside down).
Answer: take x/(x-1) and flip it upside down: (x-1)/x
The reciprocal of "x" is shown as:
1/x, or
x-1 (see exponents)
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