Question 1092999
.
<pre>
<U>Answer</U>.  x = 1752.



<U>Check</U>.  40*1752 - 777 = 69303 = 39*1777.



How did I find it? - Using MS Excel in my computer.

                     and also knowing that 40x = 777 (mod 1777) means that the difference 40x - 777 is a multiple of 1777.
</pre>

Solved.


============================
Dear "students" !


Today is a special day.

Today I solved &nbsp;16 &nbsp;problems for you and got back &nbsp;0 &nbsp;(zero, &nbsp;ZERO) &nbsp;"thanks" &nbsp;from you.


It is the absolute record&nbsp;! 
&nbsp;&nbsp;&nbsp;&nbsp;It is just out of limits of my understanding &nbsp;!
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;I never saw it before &nbsp;!


Thank you very much and wish you to think: &nbsp;&nbsp;<U>WHO ARE YOU . . . </U>