Example

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

Question

$$\{ ( \frac { 3 } { 4 } ) ^ { - 1 } - ( \frac { 1 } { 4 } ) ^ { - 1 } \} ^ { - 1 } = ?$$

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