Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 3 - Section 3.4 - Linear Equations in One Variable and Problem Solving - Exercise Set - Page 195: 12



Work Step by Step

"Twice" means multiplied by 2. The term preceding "subtracted from" is the subtrahend. The comma tells us the "twice" applies to "a number" rather than to the difference. $60-2x=20$ $\longrightarrow$addition property $60-2x-60=20-60$ $\longrightarrow$combine like terms $-2x=-40$ $\longrightarrow$multiplication property $-2x\div-2=-40\div-2$ $\longrightarrow$divide $x=20$
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