The sum of number and 12 is 30. This article is a technical mathematical article in the area of predicate logic. An open sentence in math means that it uses variables meaning that it is not known whether or not.
Equals is equal to is the result is becomes.
A mathematical sentence can also use symbols or words like equals greater than or less than. Each algebraic sentence may contain a combination of algebraic expressions and constants or with just two or more algebraic expressions. The sum of number and 12 is 30. A mathematical sentence makes a statement about the relationship between two expressions.