To make the solution of the equation (3x + 6) (2x-1) - 3K = 6 (x + 2) (X-2) non positive, find the value of natural number K Thank you

To make the solution of the equation (3x + 6) (2x-1) - 3K = 6 (x + 2) (X-2) non positive, find the value of natural number K Thank you

It's obvious that the man upstairs made a mistake. The second step was wrong
The second step should be x = K / 3-2
There is an X in the title