g(x) = 12 - 5x

If g(k) = 14, find k

I think you mean find x.

g(x)=14 every time you see g(x) plug in 14

14=12-5x Solve for x. Take 12 to the other side and change signs

14-12=-5x

2=-5x <- Divide and conquer by -5 to make x alone

x=-2/5 < - Final Answer