Example

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

Question

$$\frac{ 11 }{ 5 } + \frac{ 4 }{ 21 } \times 42- \frac{ 18 }{ 5 } \div \frac{ 27 }{ 45 }$$

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