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\varrho \left(\frac{\partial v_x}{\partial t}+v_x\frac{\partial v_x}{\partial x}+v_y\frac{\partial v_y}{\partial y}+v_z\frac{\partial v_z}{ \partial z}\right)=-\frac{\partial \varrho}{\partial x}-\left(\frac{\partial \tau _x_x}{\partial x}+\frac{\partial \tau_x_y}{\partial y}+\frac{\partial \tau_x_...