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The Brainliest Answer!
2014-04-18T14:13:40+05:30
10^{3x}=125
3x=log_{10} 125
x= \frac{1}{3}log_{10} 5^{3}=log_{10} 5
-2x=-2log_{10}5=log_{10}5^{-2}
10^{-2x}=5^{-2}= \frac{1}{25}

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thank u
u dealed with log like that i think u are...
MADAN