Confused Man with Equations

A nab who is very confused. The man is doing math in his head. There is a thought bubble above his head. In the thought bubble is "7 x 3 − 13 x 2 + 9 4 x y − 5 y 2 + ln ⁡ ( 2 x + 3 y ) = 42 z − 17 e 2 + sin ⁡ ( π x − y ) + 11" and minimalistic design, bold lines, flat colors, and a white background.