Example

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

Question

$$\frac{ { -3 }^{ 17 } \times (-4)-2 \times - { 3 }^{ 16 } }{ { 9 }^{ 7 } \times 15 }$$

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