Solve for k
k=\frac{t-2u}{2}
Solve for t
t=2\left(u+k\right)
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2k+2u=t
Swap sides so that all variable terms are on the left hand side.
2k=t-2u
Subtract 2u from both sides.
\frac{2k}{2}=\frac{t-2u}{2}
Divide both sides by 2.
k=\frac{t-2u}{2}
Dividing by 2 undoes the multiplication by 2.
k=\frac{t}{2}-u
Divide t-2u by 2.
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