Example

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

Question

$$\log _ { a } 20 - \log _ { a } 15 + \frac { 1 } { 2 } \log _ { a } \frac { 9 } { 2 }$$

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