
William W. answered 02/04/21
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Math and science made easy - learn from a retired engineer
Let "n" be "a number" then "a number added to 5" would be "n + 5"
Twice the number would be "2n" and the sum of "twice the number and 3" is "2n + 3"
So, since these two are the same, then n + 5 = 2n + 3