Solve for t
t=\frac{s-3}{2}
Solve for s
s=2t+3
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2t+3=s
Swap sides so that all variable terms are on the left hand side.
2t=s-3
Subtract 3 from both sides.
\frac{2t}{2}=\frac{s-3}{2}
Divide both sides by 2.
t=\frac{s-3}{2}
Dividing by 2 undoes the multiplication by 2.
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