exam Maths Puzzle Numerical Ability

I really need some help on this one. thank you!

t + (1/t)
_________ = 1

(1/t) - 1

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exam Other Question

A car purchased in 1998 is currently valued at $12000. If it has decreased in value exponentially at a rate of 4% per year, determine the original cost of the vehicle. Simplify the rational expression:
(x/x^2-4)- (x+2/ x^2-x-2)
I am trying to find the numerator.