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)
$x=20$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
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 - Page 99: 63
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