Example

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

Question

$$\frac { 57 } { 5 } \times \frac { 4 } { 9 } \div \frac { 6 } { 45 } - 5$$

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