Multiply both sides by 4 to clear the fractions: $\displaystyle{3}{y}-{8}={24}-{y}\usepackage{cmbright}\Huge\$

Add 8 to both sides: $\displaystyle{3}{y}={32}-{y}\usepackage{cmbright}\Huge\$

Add y to both sides: $\displaystyle{4}{y}={32}\usepackage{cmbright}\Huge\$

Divide both sides by 4: $\displaystyle{y}={8}\usepackage{cmbright}\Huge\$