Example

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

Question

$$\frac { \sqrt { 7 ^ { - 4 } \times 11 ^ { 4 } } } { 49 \times 121 }$$

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