Related Clues

• See 37A
• It has two sides
• Mathematical statement
• Algebra formula
• Its two sides are the same
• Sometimes it starts with an X
• Mathematical expression
• See 19-Across
• Newton's second law, essentially
• See 5
• A calculated balance
• There are two sides to every one
• Formula with "="
• It's even handed to a mathematician
• Situation where many factors need consideration
• E=mc², say, as one struggling with it comprehends
• Mathematical statement in a quote, perhaps?
• Extraordinary antique holds old correspondence
• It's balanced on a quite complicated basis
• Aid in some problem-solving