Correct. $\displaystyle{3}{{y}}^{{2}}+{2}{z}+{3}{z}-{9}{{y}}^{{2}}={3}{{y}}^{{2}}-{9}{{y}}^{{2}}+{2}{z}+{3}{z}=-{6}{{y}}^{{2}}+{5}{z}\usepackage{cmbright}\Huge\$ . The coefficient of the z term is 5.