Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 3 - Equations and Problem Solving - 3.4 - Equations Involving Parentheses and Fractional Forms - Problem Set 3.4: 22

Answer

$x=-13$

Work Step by Step

The distributive property allows us to distribute anything multiplied by something inside of the parenthesis to whatever is inside of the parenthesis. Thus, we distribute the -1 to everything inside of the first set of parenthesis and the -2 to everything inside of the second set of parenthesis, giving us the equation -x-7=-2x-20. We now simplify: $x-7=-20 \\\\ x=-13$
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