How do you solve L = a + (n - L)d for d?

Mar 9, 2018

$d = \frac{L - a}{n - L}$

Explanation:

Subtract $a$ from both sides.

$L - a = \left(n - L\right) d$

Divide both sides by $\left(n - L\right)$

$\frac{L - a}{n - L} = d$

Rewrite

$d = \frac{L - a}{n - L}$