Example

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

Question

$$\frac { a b - 4 b } { 5 b } \div \frac { a ^ { 2 } - 16 } { 20 }$$

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