(n-1)*7/2-77=0

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Solution for (n-1)*7/2-77=0 equation: 



(n-1)*7/2-77=0

We multiply all the terms by the denominator


(n-1)*7-77*2=0

We add all the numbers together, and all the variables

(n-1)*7-154=0

We multiply parentheses

7n-7-154=0

We add all the numbers together, and all the variables

7n-161=0

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

7n=161

n=161/7

n=23

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