Answer:
[tex]a = c/(d-r)[/tex]
Step-by-step explanation:
To solve for [tex]a[/tex], first multiply by [tex]a[/tex] on both sides to get this:
[tex]c = da - ra[/tex]
Now, you can factor out an [tex]a[/tex] from the right side to get this:
[tex]c = a(d - r)[/tex]
Now divide by [tex]d - r[/tex] in order to solve for [tex]a[/tex] and you get:
[tex]a = c/(d-r)[/tex]
