Solve for r
r=\frac{5s+K}{2}
Solve for K
K=2r-5s
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2r-5s=K
Swap sides so that all variable terms are on the left hand side.
2r=K+5s
Add 5s to both sides.
2r=5s+K
The equation is in standard form.
\frac{2r}{2}=\frac{5s+K}{2}
Divide both sides by 2.
r=\frac{5s+K}{2}
Dividing by 2 undoes the multiplication by 2.
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