Example

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

Question

$$\frac { 21 } { 27 } \frac { 7 } { x } \frac { 2 x } { 3 } = \cdots \cdots$$

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