Answer
$d=\dfrac{L-a}{n-1} $
Work Step by Step
Subtract $a$ on both sides to find:
$L-a=(n-1)d$
Divide by $n-1$ on both sides to find:
$\dfrac{L-a}{n-1} = \dfrac{(n-1)d}{n-1}
\\\dfrac{L-a}{n-1} = d
\\d=\dfrac{L-a}{n-1}
$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 1 - Section 1.5 - Problem Solving and Using Formulas - Exercise Set - Page 68: 70
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