If \( f \) and \( g \) are two real functions defined by \( f(x)=2 ...

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If \( f \) and \( g \) are two real functions defined by \( f(x)=2 x+1 \) and \( g(x)=4 x-7 \), then for what real numbers \( x \)
\[
f(x)g(x) ?
\]
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