Multiply both sides by 100: $\displaystyle{100}{\left({0.35}{x}+{1.6}\right)}={100}{\left(-{0.5}\right)}\usepackage{cmbright}\Huge\$

Apply the distributive property and simplify: $\displaystyle{35}{x}+{160}=-{50}\usepackage{cmbright}\Huge\$

Subtract 160 from both sides: $\displaystyle{35}{x}=-{210}\usepackage{cmbright}\Huge\$

Divide both sides by 35: $\displaystyle{x}=-{6}\usepackage{cmbright}\Huge\$