The number of solutions of the equation log₄(x $$-$$ 1) = log₂(x $$-$$ 3) is _________.

The sum of 162^th power of the roots of the equation x³ $$-$$ 2x² + 2x $$-$$ 1 = 0 is ________.

The area bounded by the lines y = || x $$-$$ 1 | $$-$$ 2 | is ___________.

The difference between degree and order of a differential equation that represents the family of curves given by $${y^2} = a\left( {x + {{\sqrt a } \over 2}} \right)$$, a > 0 is _________.