To solve for c:
1. Use distributive property to remove parentheses:
[tex]ac+ab=d[/tex]2. Subtract ab in both sides of the equation:
[tex]\begin{gathered} ac+ab-ab=d-ab \\ ac=d-ab \end{gathered}[/tex]3. Divide both sides of the equation into a:
[tex]\begin{gathered} \frac{a}{a}c=\frac{d}{a}-\frac{ab}{a} \\ \\ c=\frac{d}{a}-b \end{gathered}[/tex]