[tex] \frac{1}{3} x + 11.2 = x \\ \frac{1}{3} x + \frac{33.6}{3} = x \\ \frac{33.6}{3 } = \frac{3}{3} x - \frac{1}{3} x \\ \frac{2}{3} x = \frac{33.6}{3} \\ x = \frac{33.6}{3} \div \frac{2}{3} = \frac{33.6}{3} \times \frac{3}{2} \\ x = 33.6 \div 2 = 16.8 \\ x = 16.8[/tex]
