Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 4 - Test - Page 324: 13



Work Step by Step

$\frac{1}{7}-\frac{3}{x}$ $\longrightarrow$ convert to like fractions =$\frac{1\times x}{7\times x}-\frac{3\times7}{x\times7}$ $\longrightarrow$simplify =$\frac{x}{7x}-\frac{21}{7x}$ $\longrightarrow$ subtract numerators =$\frac{x-21}{7x}$
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