Example

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

Question

$$\frac{(2.1\times10^{6})\times(4.0\times10^{-3})}{4.2\times10^{-4}}$$

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