ANSWER
Step-by-step explanation
First, let us solve the given equation:
Now, we have to find the equation whose solution is 7.
To do this, substitute the value of x into each of the equations. The equation whose left and right sides are equal is the correct equation.
For the first option:
That is not the correct answer.
For the second option:
That is not the correct answer.
For the third option:
Since both sides of the equation are equal, that is the correct equation.
The correct answer is the third option.