My problem says:
Give solution to this problem of congruence, with all incongruent solutions according to the requested module and all integer solutions.
$10x \equiv 15 \mod 35$
But I can not understand the steps to solve this exercise.
I would also like to know the meaning of this equation, ie:
$(n=m) \rightarrow$ $n$ is equal to $m$
$(n\gt m \lor n\lt m) \rightarrow$ $n$ is greater or lower than $m$
But, whats means $a \equiv b\mod c$?
I hope someone can recommend any book or information to solve such equations.