Example

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

Question

$$\left. \begin{array} { l l } { } & { } & { ( 6 ^ { - 1 } - 8 ^ { - 1 } ) = } \end{array} \right.$$

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