Example

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

Question

$$( 4 ^ { - 1 } - 5 ^ { - 1 } ) ^ { - 1 } - ( 2 ^ { - 1 } - 3 ^ { - 3 } ) ^ { - 1 }$$

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