After the following two polynomials are added, the coefficient of the $\displaystyle{{a}}^{{2}}{{b}}^{{3}}\usepackage{cmbright}\Huge\$ term will be _____.

$\displaystyle{\left(-{4}{{a}}^{{2}}{{b}}^{{3}}+{2}{{a}}^{{3}}{{b}}^{{2}}-{7}{{a}}^{{2}}+{6}{{b}}^{{3}}\right)}+{\left({12}{{a}}^{{2}}{{b}}^{{3}}-{7}{{a}}^{{2}}\right)}\usepackage{cmbright}\Huge\$