Rewrite the equation as 3z-3=81.
Create equivalent expressions in the equation that all have equal bases.
Since the bases are the same, then two expressions are only equal if the exponents are also equal.
Move all terms not containing z to the right side of the equation.
Add 3 to both sides of the equation.
Add 4 and 3.
Solve for z 81=3^(z-3)