Solve for r
\left\{\begin{matrix}\\r=s+3\text{, }&\text{unconditionally}\\r\in \mathrm{R}\text{, }&s=0\end{matrix}\right.
Solve for s
s=r-3
s=0
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rs-3s=s^{2}
Use the distributive property to multiply r-3 by s.
rs=s^{2}+3s
Add 3s to both sides.
sr=s^{2}+3s
The equation is in standard form.
\frac{sr}{s}=\frac{s\left(s+3\right)}{s}
Divide both sides by s.
r=\frac{s\left(s+3\right)}{s}
Dividing by s undoes the multiplication by s.
r=s+3
Divide s\left(3+s\right) by s.
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