Example

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

Question

$$18 + 2 [ 4 + 8 - 3 \frac { 9 } { 4 } + 3 ( 2 + 6 + 5 ) \cdot 3 ^ { 2 } ]$$

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