Example

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

Question

$$x ^ { - 3 } , x = ( \frac { - 9 } { 5 } ) ^ { - 4 } + ( \frac { 18 } { 19 } ) ^ { 0 }$$

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