Example

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

Question

$$\frac { 3 } { 3 ^ { 7 a - 7 } \times 3 ^ { 3 a + 15 } }$$

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