What is the definition of equation?

An equation can be defined as a mathematical statement consisting of an equal symbol between two algebraic expressions that have the same value.

Example :

$5x + 7 = 22$ is an equation, in which $5x + 7$ and 22 are two expressions separated by an ‘equal’ sign.

Here,

$5$ - coefficient

$x$ - Variable

$7$ - Constant

$22$ - Constant