With usual notations the depth of the neutral axis of a balanced section, is given by

- 1
  
  $\frac{m c}{t} = \frac{d - n}{n}$
- 2
  
  $\frac{t}{m c} = \frac{d - n}{n}$
- 3
  
  $\frac{t}{m c} = \frac{d + n}{n}$
- 4
  
  $\frac{m c}{t} = \frac{n}{d - n}$

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