Move all terms containing p to the left side of the equation.
Subtract 2p from both sides of the equation.
Subtract 2p from 5p.
Move all terms not containing p to the right side of the equation.
Add 9 to both sides of the equation.
Add 12 and 9.
Divide each term by 3 and simplify.
Divide each term in 3p=21 by 3.
Cancel the common factor of 3.
Cancel the common factor.
Divide p by 1.
Divide 21 by 3.
Solve for p 5p-9=2p+12