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If $f : R \to R$ is defined by $g : R \to R$ are defined by $f(x) = 2x + 3$ and $g(x) = x^2 + 7$, then the values of $x$ for which $f(g(x)) = 25$, are :

( A ) $\pm 2$
( B ) $\pm 4$
( C ) $\pm 1$
( D ) $\pm 3$

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