Which of the following equations are correct?

A. $\displaystyle{26}{{x}}^{{3}}{{y}}^{{4}}{{z}}^{{2}}+{14}{{x}}^{{2}}{{y}}^{{6}}={2}{{x}}^{{2}}{{y}}^{{4}}{\left({13}{x}{{z}}^{{2}}+{7}{{y}}^{{2}}\right)}\usepackage{cmbright}\Huge\$

B. $\displaystyle{26}{{x}}^{{3}}{{y}}^{{4}}{{z}}^{{2}}+{14}{{x}}^{{2}}{{y}}^{{6}}={2}{{x}}^{{2}}{{y}}^{{4}}{{z}}^{{2}}{\left({13}{x}+{7}{{y}}^{{2}}{{z}}^{{2}}\right)}\usepackage{cmbright}\Huge\$