Let f : R → R be the function defined by f(x) = 2x - 3, ∀ x ∈ R. Then f-1(x) = ?

1
2x + 3
2
\(\rm \dfrac{x}{2}+3\)
3
\(\rm \dfrac{1}{2x-3}\)
4
\(\rm \dfrac{x+3}{2}\)

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