The value of \[ \begin{array}{l} \lim _{x \rightarrow 0} \frac{(140)^{x}-(35)^{x}-(28)^{x}-(20)^...

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The value of
\[
\begin{array}{l}
\lim _{x \rightarrow 0} \frac{(140)^{x}-(35)^{x}-(28)^{x}-(20)^{x}+7^{x}+5^{x}+4^{x}-1}{x \sin ^{2} x} \\
=2(\ln k)(\ln l)(\ln m), \text { then } k+l+m=
\end{array}
\]
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