



 
Hi Kevon, Two things to notice in this expression. First of all $2x$ means 2 times x so the expression can be seen as $2 \times x + 5.$ Secondly the letter $x$ is used to represent an unknown number. Let me illustrate with a different question.
Using the first of my two observations above this expression can be written $7 \times x  8.$ Again the letter $x$ represents an unknown number. The question then tells you that $x = 5$ so $x$ is no longer unknown. Thus the expression is $7 \times 5  8.$ Now it's easy, $7 \times 5 = 35$ so the output is $7 \times 5  8 = 35  8 = 27.$ If the question had been
then the output would be different. It would be $7 \times 3  8 = 21  8 = 13.$ Now you try the question you sent,  


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