The given equation is expressed as
[tex]\begin{gathered} p\text{ = 2a + c} \\ To\text{ solve for c, we would subtract 2a from both sides of the equation. It becomes} \\ p\text{ - 2a = 2a - 2a + c} \\ p\text{ - 2a = c} \\ c\text{ = p - 2a} \end{gathered}[/tex]