$\"\"$

The sentence is “sum of 5 times a number and 7 equals 18”.

The word “times” indicates multiplication symbol “ $\"\"$ ”

The word “sum” indicates the symbol “ $\"\"$ ”

The word “equals” indicates the symbol “ $\"\"$ ”

Let n = number $\"\"$

Rewrite the sentence into expression as,

$\"\"$

The equation is $\"\"$ . $\"\"$

The equation is $\"\"$ .