Solve for r
r=\frac{11s+K}{5}
Solve for K
K=5r-11s
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5r-11s=K
Swap sides so that all variable terms are on the left hand side.
5r=K+11s
Add 11s to both sides.
5r=11s+K
The equation is in standard form.
\frac{5r}{5}=\frac{11s+K}{5}
Divide both sides by 5.
r=\frac{11s+K}{5}
Dividing by 5 undoes the multiplication by 5.
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