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## Homework Statement

0 = [tex]\sum n_i / (b-a_i)[/tex]

the summation is goes from i = 1 to k

the question is to rationalize each term so that the denominator is positive, and then solve for b.

## Homework Equations

## The Attempt at a Solution

i tried to expand the summation and get the factor of b and stuff

but it didn't work at all

does anyone know how to solve this summation in terms of b? thanks