Answer
-$\frac{1}{3}$
Work Step by Step
$\frac{20}{21}$ -$\frac{10}{21}$-$\frac{17}{21}$ =
=$\frac{20-10-17}{21}$ =
=$\frac{-7}{21}$ =$\frac{-7\times1}{7\times3}$
= -$\frac{1}{3}$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 4 - Section 4.8 - Solving Equations Containing Fractions - Exercise Set - Page 311: 21
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