Example

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

Question

$$9\times10^{9}\frac{12\times10^{9}\times8\times10^{-9}}{15\times10^{3})^{2}}$$

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