Only option d is the correct answer as x = 3 is a solution to the equation.
To solve this problem, we have to substitute the value of x into the equation and see if it is equal to zero.
<h3>Solution of an Equation</h3>
a)

when x = -6
substitute the value of x

equation (a) is wrong.
b)

collect like terms and substitute for x

equation(b) is wrong
c)

collect like terms and substitute for x

d)

From the above calculation, only option d is the correct answer as x = 3 is a solution to the equation.
Learn more on solutions of equation here;
brainly.com/question/16863577