Question

solve for a ab+c=da= b/(c-d)a=(d-c)/ba=b+c/d

Answer 1

$\begin{gathered} ab+c=d \\ \text{Solving for a:} \\ \text{Subtrac c from both sides:} \\ ab+c-c=d-c \\ ab=d-c \\ \text{divide both sides by b:} \\ \frac{ab}{b}=\frac{d-c}{b} \\ a=\frac{d-c}{b} \end{gathered}$