Example

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

Question

$$\frac{ 3 }{ 5 } +(- \frac{ 1 }{ 2 } )- \frac{ 2 }{ 3 } \div \frac{ 8 }{ 9 } =$$

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