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?

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(32388) (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.
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