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\log_{10}\left(66\right)=\log_{10}\left(6\times 11\right)
Multiply 2 and 3 to get 6.
\log_{10}\left(66\right)=\log_{10}\left(66\right)
Multiply 6 and 11 to get 66.
\log_{10}\left(66\right)-\log_{10}\left(66\right)=0
Subtract \log_{10}\left(66\right) from both sides.
0=0
Combine \log_{10}\left(66\right) and -\log_{10}\left(66\right) to get 0.
\text{true}
Compare 0 and 0.
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