hello
to solve this question, we'll need to manipulate or work with multiplication and division rules
let the unknown number be represented by x
![\begin{gathered} (x)/(5)=-13 \\ \text{cross multiply both sides to find x} \\ x*1=5*-13 \\ x=-65 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/rb7wsi2794c6dakfbtw4g7ac092xy3b339.png)
note, i cross multiplied with 1
whenever you have a whole number i.e an integer, it is assumed mathematically to be divided by 1 e.g 5 = 5/1