SOLUTION: how do you justify each step of this problem (12+8x)+13

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Question 892808: how do you justify each step of this problem (12+8x)+13
Answer by AnlytcPhil(1806) About Me  (Show Source):
You can put this solution on YOUR website!
%2812%2B8x%29%2B13

Use the commutative principle of addition to interchange the 12 and the 8x

%288x%2B12%29%2B13

Use the associative principle of addition to move the parentheses from around
the first two terms to around the last two terms:

8x%2B%2812%2B13%29

Now we can add the 12+13 and get 25 instead of (12+13)

8x%2B25

That's it.

Edwin