Please explain steps after the steps :

At equilibrium, Y = C + l
We know, C = $\overline{c}$ + bY
Substituting value of C, we get, Y = $\overline{c}$ + bY + l
Y - bY = $\overline{c}$ + l
Y(1 - b) = $\overline{c}$ + l
$$\begin{gathered} Y=\frac{1}{\left(1-b\right)}\times \left(\overline{c}+l\right) \\ b is nothing but the MPC. So, we have : \\ Y=\frac{1}{\left(1-MPC\right)}\times \left(\overline{c}+l\right) \end{gathered}$$