A = 87000000 \quad d D =
Solve for D (complex solution)
\left\{\begin{matrix}D=\frac{A}{87000000d}\text{, }&d\neq 0\\D\in \mathrm{C}\text{, }&A=0\text{ and }d=0\end{matrix}\right.
Solve for D
\left\{\begin{matrix}D=\frac{A}{87000000d}\text{, }&d\neq 0\\D\in \mathrm{R}\text{, }&A=0\text{ and }d=0\end{matrix}\right.
Solve for A
A=87000000Dd
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87000000dD=A
Swap sides so that all variable terms are on the left hand side.
\frac{87000000dD}{87000000d}=\frac{A}{87000000d}
Divide both sides by 87000000d.
D=\frac{A}{87000000d}
Dividing by 87000000d undoes the multiplication by 87000000d.
87000000dD=A
Swap sides so that all variable terms are on the left hand side.
\frac{87000000dD}{87000000d}=\frac{A}{87000000d}
Divide both sides by 87000000d.
D=\frac{A}{87000000d}
Dividing by 87000000d undoes the multiplication by 87000000d.
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