Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 2 - Solving Equations - 2-3 Solving Multi-Step Equations - Practice and Problem-Solving Exercises: 63

Answer

20

Work Step by Step

They are all equal to 360. Thus: $5x+4x+10+80+90=360$ (simplify like terms) $9x+180=360$ (subtract 80 from both sides) $9x=180$ (divide both sides by 9 to isolate the variable) $x=20$
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