Solve for r
r=\frac{9s+K}{4}
Solve for K
K=4r-9s
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4r=K+9s
Add 9s to both sides.
4r=9s+K
The equation is in standard form.
\frac{4r}{4}=\frac{9s+K}{4}
Divide both sides by 4.
r=\frac{9s+K}{4}
Dividing by 4 undoes the multiplication by 4.
K=4r-9s
Swap sides so that all variable terms are on the left hand side.
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