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Solve for I
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Solve for D
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-30+5t+5t^{2}sI=D
Swap sides so that all variable terms are on the left hand side.
5t+5t^{2}sI=D+30
Add 30 to both sides.
5t^{2}sI=D+30-5t
Subtract 5t from both sides.
5st^{2}I=30+D-5t
The equation is in standard form.
\frac{5st^{2}I}{5st^{2}}=\frac{30+D-5t}{5st^{2}}
Divide both sides by 5t^{2}s.
I=\frac{30+D-5t}{5st^{2}}
Dividing by 5t^{2}s undoes the multiplication by 5t^{2}s.