Solve for r
r=\frac{s+K}{6}
Solve for K
K=6r-s
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6r-s=K
Swap sides so that all variable terms are on the left hand side.
6r=K+s
Add s to both sides.
6r=s+K
The equation is in standard form.
\frac{6r}{6}=\frac{s+K}{6}
Divide both sides by 6.
r=\frac{s+K}{6}
Dividing by 6 undoes the multiplication by 6.
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