Example

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

Question

$$6 \cdot 36 + 13 \cdot \{ 15 + 12 - ( 0 + 6 + 6 + 2 ) \} =$$

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