Example

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

Question

$$\frac{ { 10 }^{ 9 } \times { 10 }^{ -7 } }{ { 10 }^{ -3 } }$$

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