#### Answer

-$\frac{1}{3}$

#### Work Step by Step

$\frac{20}{21}$ -$\frac{10}{21}$-$\frac{17}{21}$ =
=$\frac{20-10-17}{21}$ =
=$\frac{-7}{21}$ =$\frac{-7\times1}{7\times3}$
= -$\frac{1}{3}$

Published by
Pearson

ISBN 10:
0321955048

ISBN 13:
978-0-32195-504-3

-$\frac{1}{3}$

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