[tex] \frac{x - 1}{3} + \frac{3x + 1}{2} = \frac{1}{3} \\ \\ 2(x - 1) + 3(3x + 1) = 2 \\ \\ 2x - 2 + 9x + 3 = 2 \\ \\ 11x + 1 = 2 \\ \\ 11x = 2 - 1 \\ \\ 11x = 1 \\ \\ 11x \div 11 = 1 \div 11 \\ \\ x = 1 \div 11 \\ \\ fraccion \: x = \frac{1}{11} \\ decimal \: x = 0.09[/tex]
