Example

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

Question

$$( 9 - 2 \frac { 2 } { 3 } \cdot 2 \frac { 1 } { 7 } ) \cdot \frac { 21 } { 46 } =$$

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