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7-\log_{7}\left(7^{7}\right)
Apply rule a^{\log_{a}\left(b\right)}=b, where a=7 and b=7.
7-\log_{7}\left(823543\right)
Calculate 7 to the power of 7 and get 823543.
7-7
The base 7 logarithm of 823543 is 7.
0
Subtract 7 from 7 to get 0.
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