To find the value of x, we must move all of the constant (number) terms to one side of the equation and the variable x to the other side of the equation.
4x - 9 = 31
First, we should add 9 to both sides of the equation so that the -9 cancels out on the left side of the equation.
4x = 40
Next, we should divide both sides of the equation by 4 so that we can cancel out the coefficient of 4 on the variable x.
x = 10
Then, to find the value of 6x, we must substitute in our known value for x into the expression 6x.
6x = 6(10)
To simplify, we should multiply these two numbers together.
60
Therefore, your answer is 60.
Hope this helps!