9(p-4)= 6p
multiply the bracket by 9
(9)(p)=9p
(9)(-4)=-36
9p-36=6p
move +9p to the other side to combine like terms
sign changes from +9p to -9p
9p-9p-36=6p-9p
-36=6p-9p
-36=-3p
divide both sides by -3 to get p by itself
-36/-3=-3p/3
12=p
answer:
p=12