If we take both sides of the equation
and multiply either expression by 3, the equality becomes
![3\cdot(1)/(3)x=3\cdot5\\x=15](https://img.qammunity.org/2019/formulas/mathematics/middle-school/ffey02ok7pjtomgfahf6v0krytkfzlp3a5.png)
Multiplication of both sides of an equality by the same number keeps the equality true, and we call this property the multiplication property of equality.