Example

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

Question

$$= \frac { 400 \times 10 \times 9 \times 3 \times 4 } { 20 \times 8 \times 4 \times 1 }$$

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