can anyone explain this step 3*886308865 = 633077761?

In the example how is 3 x 8^-1 = 3 x 886308865?

I am getting time out but the code is running and showing correct output in anaconda

Everything is made damn complicated in that formulation of the problem: Why can't the solution just be the fraction as a float with a given precision as in the original euler problem or if they want a reduced fraction ? Why aren't the modulo numbers copy- pastable ?

How 3 * 886308865 = 633077761 please help me