Consider the following equation.

$\displaystyle{\left({22}{p}{y}+{32}{{y}}^{{3}}{{q}}^{{2}}+{39}{q}\right)}-{\left({15}{p}{y}+{17}{q}+{3}{{y}}^{{3}}{{q}}^{{2}}\right)}-{\left({50}{{y}}^{{3}}{{q}}^{{2}}-{23}{p}{y}\right)}=\usepackage{cmbright}\Huge\$ ___ $\displaystyle-{21}{{y}}^{{3}}{{q}}^{{2}}+{22}{q}\usepackage{cmbright}\Huge\$

Fill in the blank with the missing term. To represent the exponent $\displaystyle{{a}}^{{b}}\usepackage{cmbright}\Huge\$ , write a^b.