Multiply both sides by 4 to clear the fractions: $\displaystyle{3}{y}-{32}={16}-{y}\usepackage{cmbright}\Huge\$

Add 32 to both sides: $\displaystyle{3}{y}={48}-{y}\usepackage{cmbright}\Huge\$

Add y to both sides: $\displaystyle{4}{y}={48}\usepackage{cmbright}\Huge\$

Divide both sides by 4: $\displaystyle{y}={12}\usepackage{cmbright}\Huge\$