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Let f(x) = x 5 + 2x 3 + 3x + 1, x ∈ R, and g(x) be a function such that g(f(x)) = x for all x ∈ R. Then ) 7 ( ' g ) 7 ( g is equal to :

1. 7
2. 42
3. 1
4. 14

Correct answer: 14

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