Example

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

Question

$$\frac{5^{n+2}-5^{n+1}}{5^{n+1}}$$

Evaluate

$4$

Factor

$2^{2}$

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