Example

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

Question

$$\frac { 2 } { 3 } [ 6 + \{ 4 + 10 - 2 \} \times 4 ]$$

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