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How do you show the steps to combing like terms.

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2 Answers

The distributive property allows you to pull the g out and you add the numbers in front of each term so

12g + 7g = (12 + 7)g = 19g. You start with a problem involving a variable and by using the distributive property, you get a problem in arithmetic, something you already know. That's the step you are looking for.

For the problem you put up you would simply add the numbers together and keep the g after it 

12g+7g=19g 

I hope this helps.