Respuesta :

Step 1. The expression that we have is:

[tex]3x-9=6[/tex]

And we need to solve for x.

If we are going to solve for x, we need to have the 'x' alone on one side of the equation.

For that, the first step is to add 9 to both sides:

[tex]3x-9+9=6+9[/tex]

Step 2. On the left side, -9+9 cancel each other, and on the right side 6+9 is 15:

[tex]3x=15[/tex]

Step 3. The next step is to divide both sides by 3:

[tex]\frac{3x}{3}=\frac{15}{3}[/tex]

In this way, 3/3 on the left side cancel each other and we are left only with x:

[tex]x=\frac{15}{3}[/tex]

And on the right side, 15/3 is equal to 5:

[tex]\boxed{x=5}[/tex]

This is shown in option D.

Answer:

D. x=5