Example

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

Question

$$2 - \frac { 2 } { 3 } \times \frac { 9 } { 16 } \times \frac { 4 } { 27 }$$

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