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Solution

(related to Problem: Sums of Powers of Two)

$$\sum_{x=-5}^9 2^x=2^x\;\Rule{1px}{4ex}{2ex}^{10}_{-5}= 2^{10}-2^{-5}=\frac{32767}{32}.$$

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References

Bibliography

  1. Miller, Kenneth S.: "An Introduction to the Calculus of Finite Differences And Difference Equations", Dover Publications, Inc, 1960