2,5x=1

To solve the equation \( 2.5x = 1 \), you can follow these steps:

1. Divide both sides of the equation by \( 2.5 \):

   \[ x = \frac{1}{2.5} \]

2. Simplify the right side:

   \[ x = \frac{1}{2.5} = \frac{1}{\frac{25}{10}} = \frac{10}{25} = \frac{2}{5} \]

So, the solution to the equation \( 2.5x = 1 \) is:

\[ x = \frac{2}{5} \] or \( x = 0.4 \) (in decimal form).