Answer: a = 28
We are given a/ 4 = 7
[tex]\begin{gathered} \frac{a}{4}\text{ = 7} \\ \text{Isolate a by cross multiplying} \\ a\text{ = 4 x 7} \\ a\text{ = 28} \\ \text{check:} \\ \text{ Since, a = 28} \\ \text{Put the value of a into the previous equation} \\ \frac{28}{4}\text{ = 7} \end{gathered}[/tex]