An equation is a math statement containing a variable and an equal sign that says that two quantities are equal.

In a first-degree equation in one variable, the variable is generally called an unknown.

### See also :

- Algebraic equation
- Standard equation
- Equation of a line
- First-degree equation in one unknown
- Second-degree equation
- Exponential equation
- General equation
- Inconsistent Equation
- Indeterminate equation
- Irrational equation
- Linear equation
- Literal equation
- Logarithmic equation
- Numerical equation
- Parametric equation
- Polynomial equation
- Quadratic equation
- Rational equation
- Symmetric equation
- Transcendental equation
- Trigonometric equation