Solve {l}{A=680x/d^2}{a=x}{text{Solvefor}btext{where}}{b=a}

$$\left. \begin{array} { l } { A = \frac{680 x}{d ^ {2}} }\\ { a = x }\\ { \text{Solve for } b \text{ where} } \\ { b = a } \end{array} \right.$$

Solve for x (complex solution)

$$x=\frac{Ad^{2}}{680}$$

$$\left(d\neq 0\text{ and }a=0\text{ and }A=0\text{ and }b=0\right)\text{ or }\left(d=-2A^{-\frac{1}{2}}\sqrt{170b}\text{ and }b\neq 0\text{ and }A\neq 0\text{ and }a=b\right)\text{ or }\left(d=2A^{-\frac{1}{2}}\sqrt{170b}\text{ and }b\neq 0\text{ and }A\neq 0\text{ and }a=b\right)$$

Solve for x

$$x=\frac{Ad^{2}}{680}$$

$$\left(a=0\text{ and }A=0\text{ and }b=0\text{ and }d\neq 0\right)\text{ or }\left(d\neq 0\text{ and }a=b\text{ and }A<0\text{ and }b<0\text{ and }|d|=2\sqrt{\frac{170b}{A}}\right)\text{ or }\left(d\neq 0\text{ and }a=b\text{ and }A>0\text{ and }b>0\text{ and }|d|=2\sqrt{\frac{170b}{A}}\right)$$