Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 6 - Section 6.3 - Equations with Parentheses - Exercises - Page 242: 11

Answer

x=7.2

Work Step by Step

Simplifying 5(x + -3) = 21 Reorder the terms: 5(-3 + x) = 21 (-3 * 5 + x * 5) = 21 (-15 + 5x) = 21 Solving -15 + 5x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 5x = 21 + 15 Combine like terms: -15 + 15 = 0 0 + 5x = 21 + 15 5x = 21 + 15 Combine like terms: 21 + 15 = 36 5x = 36 Divide each side by '5'. x = 7.2 Simplifying x = 7.2
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