The Balance Sheet balances, as can be seen from the figures in row 22 and 24, and confirmed by the check in row 26. This logical check returns TRUE if the items in row 22 are the same as those in the corresponding columns of row 24.
Finally, as can be seen from the formula display in column J, all the formulas use only simple arithmetic or are direct references to other cells. In particular, there are no Excel functions used or required.