Daniel B. answered 12/17/20
Tutor
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A retired computer professional to teach math, physics
To calculate the inverse, set
y = 12x/(x-1)
and express x as a function of y
y(x-1) = 12x
x = y/(y-12)
If you want to write h-1 as a function of x rather than y, then
h-1(x) = x/(x-12)