Khan work...........

[tex]\huge\text{Answer:}[/tex]
[tex]\huge\mathrm{k=-40} \checkmark[/tex]
[tex]\huge\text{Solution:}[/tex]
28 is 12 less than k.
28=12-k
How to Solve:
Steps
[tex]\bigstar[/tex] Move -k to the left:
k+28=-12
[tex]\bigstar[/tex] Move 28 to the right:
k=-12-28
[tex]\bigstar[/tex] Solve.
k=-40
Hope you find it helpful.
Feel free to ask if you have any doubts.
[tex]\bold{-MistySparkles^**^*}[/tex]