Question 774851
{{{(2x–1)^2–9=0}}}
(2x – 1)^2 – 9 = 0


Solvable in three steps.

(!)  Add 9 to both sides.
(!)  Exponentiate both sides by {{{(1/2)}}} power.
(!)  Add 1 to both sides.


WHOOOOPS!!  I made a mistake.  The solving process needs one more step.