2+2

The expression involves multiple components:

• The number at the center is a 0, which seems to be subtracted by a set of fractions and calculations.
• There's what looks like handwriting attempting to factor in another computation.
• A fraction is set around the 0 possibly indicating it’s part of the entire operation encompassed by parentheses.

The visible portion, meanwhile, involves formulas and punctuation around the sections found left and right of the “whole number” or horizontal bar:

3 / 317.35

• This indicates a result dividing 3 by 317.35.

The parts may work conjunctively within a system or calculation dependent on missing sections within the image, necessary for precise operation.