Example

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

Question

$$( 3 ) ^ { - 2 } + ( 4 ) ^ { - 2 } - ( 5 ) ^ { - 2 } \} ^ { 0 }$$

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