I need to make e the subject of the formula
T = n(1+e) / (1-e)
Forgot how to do these complicated ones
1. Multiply both sides of the equation by (1 - e)
2. Expand the brackets on both sides.
3. Collect all terms containing e at the LHS of the equation, all others at the RHS:
$\displaystyle -T \cdot e - n \cdot e = n - T$
4. Factor out e at the LHS.
5. Divide both sides of the equation by -( T + n)