Write an equation for the transformation of f(x)=|x| as shown in the figure, which passes (3, 3) and are piecewise.

Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
Question: Write an equation for the transformation of f(x)=|x| as shown in the figure, which passes (3, 3) and are piecewise.

Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
Question: Write an equation for the transformation of f(x)=|x| as shown in the figure, which passes (3, 3) and are piecewise.
