Решите уравнение 9х=1, 1/2х=1, 3 2/5=1, 2/13х=1

Решите задачу:

$9x = 1 \\ x = \frac{1}{9} \\ \\ \frac{1}{2} x = 1 \\ x = 1 \div \frac{1}{2} = 1 \times \frac{2}{1} \\ x = 2 \\ \\ 3 \frac{2}{5} x = 1 \\x = 1 \div 3 \frac{2}{5} = 1 \div \frac{17}{5} = 1 \times \frac{5}{17} \\ x = \frac{5}{17} \\ \\ \frac{2}{13} x = 1 \\ x = 1 \div \frac{2}{13} \\ x = 1 \times \frac{13}{2} \\ x = \frac{13}{2} = 6 \frac{1}{2}$