Solve for t
t=\frac{10-d}{3}
Solve for d
d=10-3t
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10-3t=d
Swap sides so that all variable terms are on the left hand side.
-3t=d-10
Subtract 10 from both sides.
\frac{-3t}{-3}=\frac{d-10}{-3}
Divide both sides by -3.
t=\frac{d-10}{-3}
Dividing by -3 undoes the multiplication by -3.
t=\frac{10-d}{3}
Divide d-10 by -3.
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