Which property is not used to simplify the following expression?

$\displaystyle{2}\cdot{\left({x}+{5}\right)}+{7}{x}={\left({2}{x}+{10}\right)}+{7}{x}\usepackage{cmbright}\Huge\$

$\displaystyle={\left({10}+{2}{x}\right)}+{7}{x}\usepackage{cmbright}\Huge\$

$\displaystyle={10}+{\left({2}{x}+{7}{x}\right)}\usepackage{cmbright}\Huge\$

$\displaystyle={10}+{9}{x}\usepackage{cmbright}\Huge\$

$\displaystyle={9}{x}+{10}\usepackage{cmbright}\Huge\$