Example

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

Question

$$420=3 \times { 10 }^{ 6 } \times { 10 }^{ -8 } \times 39 \times 12 \times N \times 4$$

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