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❖ 5x + 2x + 7x = 14x

All these numbers have the same variable so you are able to add them all up together.

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When you simplify you are combining like terms. All the numbers in this equation are like terms so this is simple. 5x + 2x +7x.  

5x+2x=7x then you do 7x+7x and that is 14x.

So your simplified answer for 5x + 2x +7x is 14x

I hope this helps!! Have a great day!