Solve for r
r=\frac{s+K}{8}
Solve for K
K=8r-s
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8r-s=K
Swap sides so that all variable terms are on the left hand side.
8r=K+s
Add s to both sides.
8r=s+K
The equation is in standard form.
\frac{8r}{8}=\frac{s+K}{8}
Divide both sides by 8.
r=\frac{s+K}{8}
Dividing by 8 undoes the multiplication by 8.
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