Solve for d
\left\{\begin{matrix}d=\frac{t}{E}\text{, }&t\neq 0\text{ and }E\neq 0\\d\neq 0\text{, }&E=0\text{ and }t=0\end{matrix}\right.
Solve for E
E=\frac{t}{d}
d\neq 0
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Ed=t
Variable d cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by d.
\frac{Ed}{E}=\frac{t}{E}
Divide both sides by E.
d=\frac{t}{E}
Dividing by E undoes the multiplication by E.
d=\frac{t}{E}\text{, }d\neq 0
Variable d cannot be equal to 0.
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