640=5(2)^n-1

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Solution for 640=5(2)^n-1 equation: 



640=5(2)^n-1

We move all terms to the left:

640-(5(2)^n-1)=0

We get rid of parentheses

-52^n+1+640=0

We add all the numbers together, and all the variables

-52^n+641=0

We move all terms containing n to the left, all other terms to the right

-52^n=-641

n=-641/1

n=-641

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