[color=#008000]\mathbf{x}^{n+1}_0 = \mathbf{x}^{n}_0 + \Delta t \, \mathbf{M}^{-1} (\mathbf{r} - \mathbf{K} \, \mathbf{x}^{n}_0)[/color][color=#008000][/color]
[color=#008000]\mathbf{x}^{n+1}_0 = \mathbf{x}^{n}_0 + \Delta t \, \mathbf{M}^{-1} (\mathbf{r} - \mathbf{K} \, \mathbf{x}^{n}_0)[/color][color=#008000][/color]