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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 Irio
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2 Answers

4 votes
subtraction property of equality
User Jess Thrysoee
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1 vote
In this case, we subtracted 7 from both sides since the (+7) disappeared from the first side, and the 15 decreased to 8 (15-8=7).
So it's the subtraction property of equality.
User Dovka
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