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The question says; shown here is a mathematical step taken when solving an equation. Identify the mathematical reason or property used to simplify from the first step to the second step.
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The question says; shown here is a mathematical step taken when solving an equation. Identify the mathematical reason or property used to simplify from the first step to the second step.

The question says; shown here is a mathematical step taken when solving an equation-example-1
User Petezah
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2 Answers

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In this case, we added 9 in both sides so (-9) in the first disappeared and 21 increased to 30 (And 30 - 21 = 9).
So it's the addition property of Equality.
User Afeshia
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1 vote
addition property of equality
User Amirsalar
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