Example

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

Question

$$\frac{ { 5 }^{ n+3 } - { 6.5 }^{ n+1 } }{ 9 \times { 5 }^{ n } -4 \times { 5 }^{ n } }$$

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