Example

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

Question

$$( P r o v e ) : \frac { 5 ^ { x } - 5 ^ { x - 1 } } { 4 \times 5 ^ { x - 1 } } = 1$$

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