Example

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

Question

$$5 - \frac { 10 } { 5 } + \frac { 20 } { 9 } - \frac { 40 } { 27 }$$

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