Example

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

Question

$$[ 5 ^ { - 1 } + \frac { 3 ^ { - 2 } } { 2 ^ { - 2 } } ] ^ { - 1 }$$

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