p=-3
p/12 =-1/4
First you should cross multiply -1/4 by 4/-1 to cancel it out, but because you did it on that side you also now have to cross multiply
p/12 • 4/-1
It would look like this
4 p
— • —
-1 12
U can see the first thing we can cancel is 4 so do 4/4 and 12/4 which use us 1/-1 and p/3
then P also means 1 and you cant cancel out 1 and -1 so instead your just left with -3/1 and it’s -3