To get the answer we have to obtain single p on the LHS.
-2p-4=2 /:-2 (divide both sides by -2)
p+2=-1 /-2 (subtract 2 both sides)
p=-3 - its the answer
-2p - 4 = 2
Add 4 to each side: -2p = 6
Divide each side by 2 : -p = 3
Multiply each side by -1 : p = -3
First subtract 12 from each side. Then divide each side by 4, and you’ll have the answer staring you in the face.