# What are equations?

Equations are made up of two expressions on either side of an equals sign, such as:

$x + 1 = 2$

To solve an equation, you aim to find the value of the missing number.

### Example

'I think of a number, add four, and the answer is seven.'

Written algebraically, this statement is $$x + 4 = 7$$, where $$x$$ represents the number you thought of.

$$x + 4 = 7$$ is an example of an algebraic equation where $$x$$ represents the unknown number.

The number you first thought of must be three ($$3 + 4 = 7$$). Therefore, $$x = 3$$ is the solution to the equation $$x + 4 = 7$$.