To determine Mario's present age (x), we can set up the equation based on the information given:
In 7 years, Mario will be 19 years old. Therefore, we can write:
\[ x + 7 = 19 \]
This equation states that if we add 7 years to Mario's current age (x), we will obtain 19.
So, the correct equation to determine Mario's present age is:
x + 7 = 19