Example

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

Question

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

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