Find the error in the calculations below:

Line (1): $\displaystyle-{2}{\left(-{5}{x}+{4}\right)}\geq-{10}\usepackage{cmbright}\Huge\$

Line (2): $\displaystyle-{5}{x}+{4}\geq{5}\usepackage{cmbright}\Huge\$

Line (3): $\displaystyle-{5}{x}\geq{1}\usepackage{cmbright}\Huge\$

Line (4): $\displaystyle{x}\leq-\frac{{1}}{{5}}\usepackage{cmbright}\Huge\$

Line (5):