Someone just derived their way to a holiday greeting! Starting with a complex equation, they manipulated variables and functions through several mathematical steps until—BAM!—the final line reveals "merry = x - mas".
It's like watching a math magician pull a festive rabbit out of an algebraic hat! The beauty is in how they work backward from the punchline, constructing each step to lead perfectly to "Merry X-mas."
This is what happens when mathematicians get into the holiday spirit but can't bear to put down their chalk. Gift-wrapping might be beyond them, but they'll absolutely crush the equation-based greeting card market!