Which of these equations are correct?

A. $\displaystyle{18}{{x}}^{{3}}{{y}}^{{2}}+{30}{{x}}^{{2}}{{y}}^{{4}}-{42}{x}{{y}}^{{3}}={6}{x}{{y}}^{{2}}{\left({3}{{x}}^{{2}}+{5}{x}{{y}}^{{2}}-{7}{y}\right)}\usepackage{cmbright}\Huge\$

B. $\displaystyle{18}{{x}}^{{3}}{{y}}^{{2}}+{30}{{x}}^{{2}}{{y}}^{{4}}-{42}{x}{{y}}^{{3}}={6}{x}{{y}}^{{2}}{\left({{x}}^{{2}}+{x}{{y}}^{{2}}-{y}\right)}\usepackage{cmbright}\Huge\$