Number of real solutions of the equation \( \sqrt{\log _{10}(-x)}=\log _{10} \sqrt{x^{2}} \) is ...

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Number of real solutions of the equation \( \sqrt{\log _{10}(-x)}=\log _{10} \sqrt{x^{2}} \) is :
\( \mathrm{P} \)
(A) zero
(B) exactly 1
(C) exactly 2
(D) 4
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