# SOLUTION: How do you find out the answer of this question 5x+7x and do you always have to do a check for your answer?

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 Click here to see ALL problems on Linear Algebra Question 315682: How do you find out the answer of this question 5x+7x and do you always have to do a check for your answer?Answer by Fombitz(13828)   (Show Source): You can put this solution on YOUR website! Just like 5 oranges and 7 oranges give you 12 oranges or 5 cupcakes and 7 cupcakes gives you 12 cupcakes. It just happens that they're x's and not oranges or cupcakes. You treat them the same though. . . . Checking your answer is a good habit to get into. It can save you from an embarassing error or verify that you didn't do something wrong in a complicated calculation.