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What property is used to solve m-7=13

I am having trouble naming the properties used to solve these equations. I know how to solve them, but by memory. help?

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Arthur D. | Effective Mathematics TutorEffective Mathematics Tutor
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Addition Property of Equality
(you can add the same number to both sides of an equation)
if a=b, then a+c=b+c and c+a=c+b
if m-7=13, then m-7+7=13+7, m+0=20, m=20

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