Undoing Multiplication

Four concert tickets cost $60 in all. One ticket costs $x$ dollars, so four tickets cost $4x$ dollars:

$$4x = 60$$

$4x$ means 4 times $x$. The number in front of $x$, here 4, is called the coefficient.

Dividing is the opposite of multiplying. So divide both sides by 4:

$$\frac{4x}{4} = \frac{60}{4}$$

$$x = 15$$

One ticket costs $15.