Which equation has no solution?

Question

Prompt

- 19 x - \frac{1}{7} = - 19 x - \frac{1}{7}

- 19 x - \frac{1}{7} = - 19 x + \frac{1}{7}

- 19 x - \frac{1}{7} = 19 x - \frac{1}{7}

- 19 x - \frac{1}{7} = 19 x + \frac{1}{7}