You can put this solution on YOUR website!
This problem is similar to your previous one, I think. Again, you want to solve for x.
Use the distributive property
Next step, variables (unknowns) on one side, knowns on the other.
Use the additive inverse of (-18) or (18).
Use the additive inverse of -3x or (3x).
OK, now what? This is a true statement, independent of the x value. This is an identity. The previous problem together with this show you the range of answers you can get in algebra from no solution to one solution to multiple solutions to an infinite number of solutions.