Example

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

Question

$$15\frac{1}{3}-[\frac{2}{3}\div\{(\frac{5}{2}-\frac{1}{3})\times\frac{3}{13}\}]$$

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