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An equation is a mathematical statement that shows the equality between two expressions. It typically includes variables, numbers, and mathematical operations such as addition, subtraction, multiplication, and division. The goal of an equation is to find the value of the variable(s) that satisfy the equation. Equations can be simple or complex and are used in various fields of mathematics and science to solve problems and analyze relationships between quantities. They provide a systematic way to represent real-world phenomena and make predictions based on mathematical principles. Understanding equations is essential for problem-solving and critical thinking skills in many academic disciplines.

The main products of an equation depend on the reactants involved and the type of reaction taking place. Examples include water in the combustion of hydrogen gas (2H2 + O2 --> 2H2O) or sodium chloride in a double displacement reaction (NaOH + HCl --> NaCl + H2O).