Example

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

Question

$$\frac { 12 \cdot 15 ^ { - 3 } \times 10 \cdot 3413 } { 161 \cdot 5 }$$

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