An equation.
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It's called an equation
when a symbol such as <or> is placed between two expressions
Do you mean like this: (x + 5)(2x + 7) If so, then it means you multiply.
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That's called an "operator", for example, the plus sign in 3 + 4. The numbers are the "operands" - that is, the numbers (or expressions) operated upon. More precisely, a binary operator, since it works with two operands. In theory, an operand is just a special way of writing a function, since a third number is calculated, according to certain rules, from the other two.