Example

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

Question

$$\sum _ { n = 1 } ^ { \infty } \frac { ( - 1 ) ^ { n + 1 } } { 7 ^ { n } }$$

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