Example

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

Question

$$20\cdot2^{4n-6}-80\cdot(4^{n-2})^{2}$$

Evaluate

$0$

Factor

$0$

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