Example

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

Question

$${ \left( \frac{ 1 }{ 3 } \right) }^{ x } = \frac{ 1 }{ 81 }$$

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