what is the variable

[k=(k-4)/2-2] = -8
You're welcome

Guest:

k=(k-4)/2-2 what is k

If you write this down as upright fractions then you wont need as many brackets and it will be much easier to read and understand.

k=[(k-4)/2]-2

k=(k-4)/2 - 4/2

k=(k-4)/2 - 4/2

k= (k-4-4) / 2

Can you do it from here?