Άγνωστος μήνας

Ποιος είναι ο μήνας $χ$;

$\text{April} \times \text{May} - \text{June} = \text{December} - \text{January}$

$\text{September} \div \text{November} \times \text{December} = \text{March} \times \text{March}$

$\text{January} \times \text{February} \div (\text{February} + x ) = \text{April}$