Answer:
[tex] \frac{m}{k} = x \\ \\ kx = m \\ \\ k = \frac{m}{x} [/tex]
I hope I helped you^_^
[tex] \frac{m}{k} = x \\ \\ \frac{1}{k} = \frac{x}{m} \\ \\ k = \frac{m}{x} [/tex]
Hope it helps