Solve for r
r=2\left(s+3\right)
Solve for s
s=\frac{r-6}{2}
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3r=18+6s
Add 6s to both sides.
3r=6s+18
The equation is in standard form.
\frac{3r}{3}=\frac{6s+18}{3}
Divide both sides by 3.
r=\frac{6s+18}{3}
Dividing by 3 undoes the multiplication by 3.
r=2s+6
Divide 18+6s by 3.
-6s=18-3r
Subtract 3r from both sides.
\frac{-6s}{-6}=\frac{18-3r}{-6}
Divide both sides by -6.
s=\frac{18-3r}{-6}
Dividing by -6 undoes the multiplication by -6.
s=\frac{r}{2}-3
Divide 18-3r by -6.
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