What property is used to solve m-7=13

Question

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

Answer 1

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