[tex]\frac{k}{5} +3-3k=-6k[/tex]
Multiply both sides of the equation by 5
[tex]k+15-15k=-30k[/tex]
Move the expression to the right side and change the sign
[tex]k=-15-30k+15k[/tex]
Combine Like terms
[tex]k=-15-15k[/tex]
So I think the final answer would be k=-15-15k