Example

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

Question

$$\left. \begin{array} { l } { ( R ) : 7 ^ { 8 } \div 7 ^ { - 7 } 7. } \end{array} \right.$$

Evaluate

$R$

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