Example

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

Question

$$[ \frac{ 9 }{ 16 } \times \frac{ -3 }{ 9 } ]+[ \frac{ 9 }{ 16 } \times \frac{ 4 }{ 12 } ]$$

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