20 to the power -x=1/7
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20^-x=1/7
1/20^x=1/7
20^x=7
and20^(2/3)=7 (approx)
so x=2/3 (aprox)
1/20^x=1/7
20^x=7
and20^(2/3)=7 (approx)
so x=2/3 (aprox)
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