Solve for r
\left\{\begin{matrix}r=\frac{a}{s}-7\text{, }&s\neq 0\\r\in \mathrm{R}\text{, }&a=0\text{ and }s=0\end{matrix}\right.
Solve for a
a=s\left(r+7\right)
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a=sr+7s
Use the distributive property to multiply s by r+7.
sr+7s=a
Swap sides so that all variable terms are on the left hand side.
sr=a-7s
Subtract 7s from both sides.
\frac{sr}{s}=\frac{a-7s}{s}
Divide both sides by s.
r=\frac{a-7s}{s}
Dividing by s undoes the multiplication by s.
r=\frac{a}{s}-7
Divide a-7s by s.
a=sr+7s
Use the distributive property to multiply s by r+7.
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