: A number that, when substituted for the variable, makes the equality true is called a root or a solution.

“It is the first time students are asked to think algebraically, recognizing the difference between an expression and an equation.” YouTube · Daniel Edey · 6 years ago Алгебра 7-9 класс Бевз | PDF - Scribd

Students and educators often note the transition from basic arithmetic to the "mathematical language" used in these early algebra chapters.

: The paragraph outlines the systematic process of finding all possible roots or proving that no roots exist.