Expand the following: \begin{align} t_s=\frac{-Fb_2}{m} * ts_2 + g * ts_2" * sin α + v_0 &= \cssId{Step1}{ ts_2 * (\frac{Fb_2}{m} - g * sin α)} \\[3px] &\cssId{Step2}{{}=\frac{v_0}{ \frac{-Fb_2}{m} - g * sin α} } \\[3px] \end{align}