Example

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

Question

$$[(5+9\div3\div6\div4)(\frac{9}{4}\div\frac{4}{9}+3+\frac{1}{5})-[7-9]5]$$

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