Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\log \frac { 51 } { 16 } + \log \frac { 45 } { 85 } - \log \frac { 99 } { 40 }$$

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