Orthogonality & Least Squares · Hard problem

Apply Gram–Schmidt to $\mathbf u = (-2, -1, 0)$, $\mathbf v = (2, 3, 1)$ (in that order, without normalizing). Find the second vector $\mathbf w_2 = \mathbf v - \operatorname{proj}_{\mathbf u}\mathbf v$.