Answer
x=20
Work Step by Step
Start with the given equation.
$(x+21)+(2x+9)=90$
Combine like terms.
$3x+30=90$
Subtract 30 from each side and simplify.
$3x+30-30=90-30$
$3x=60$
Divide each side by 3 and simplify.
$3x\div3=60\div3$
$x=20$
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 2 - Reasoning and Proof - Get Ready! - Page 79: 10
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