Example

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

Question

$$\frac{\frac{2b}{b-4}-\frac{3}{b^{2}}}{\frac{5}{5b-20}+\frac{3}{4b^{2}-16b}}$$

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