Problema 1 (6)

Expand the following: \begin{align} ΣF_y=0 ->&\cssId{Step1}{F_a × D_1 - F_b × D_2 =0}\\[3px] &\cssId{Step2}{F_a × D_1 = F_b × D_2}\\[3px] &\cssId{Step3}{\frac{F_a × D_1}{D_2} = F_b}\\[3px] \end{align}